VS: Fix MSBuild property for nostdlib flag

The C# flag table added by commit 9b06c22648 (VS: Add flag tables for
C#, 2016-12-01, v3.8.0-rc1~230^2) and preserved by commit 6e947179a8
(Add json flag tables for C#, 2018-11-21, v3.14.0-rc1~282^2~27) was
written by hand.  Fix the entry name for the `NoStdLib` property.

Fixes: #24077

Templates/MSBuild/FlagTables/v10_CSharp.json

@@ -477,21 +477,21 @@
     "flags": []
   },
   {
-    "name":  "NoStandardLib",
+    "name":  "NoStdLib",
     "switch": "nostdlib",
     "comment": "",
     "value": "true",
     "flags": []
   },
   {
-    "name":  "NoStandardLib",
+    "name":  "NoStdLib",
     "switch": "nostdlib-",
     "comment": "",
     "value": "false",
     "flags": []
   },
   {
-    "name":  "NoStandardLib",
+    "name":  "NoStdLib",
     "switch": "nostdlib+",
     "comment": "",
     "value": "true",

Templates/MSBuild/FlagTables/v11_CSharp.json

@@ -477,21 +477,21 @@
     "flags": []
   },
   {
-    "name":  "NoStandardLib",
+    "name":  "NoStdLib",
     "switch": "nostdlib",
     "comment": "",
     "value": "true",
     "flags": []
   },
   {
-    "name":  "NoStandardLib",
+    "name":  "NoStdLib",
     "switch": "nostdlib-",
     "comment": "",
     "value": "false",
     "flags": []
   },
   {
-    "name":  "NoStandardLib",
+    "name":  "NoStdLib",
     "switch": "nostdlib+",
     "comment": "",
     "value": "true",

Templates/MSBuild/FlagTables/v12_CSharp.json

@@ -477,21 +477,21 @@
     "flags": []
   },
   {
-    "name":  "NoStandardLib",
+    "name":  "NoStdLib",
     "switch": "nostdlib",
     "comment": "",
     "value": "true",
     "flags": []
   },
   {
-    "name":  "NoStandardLib",
+    "name":  "NoStdLib",
     "switch": "nostdlib-",
     "comment": "",
     "value": "false",
     "flags": []
   },
   {
-    "name":  "NoStandardLib",
+    "name":  "NoStdLib",
     "switch": "nostdlib+",
     "comment": "",
     "value": "true",

Templates/MSBuild/FlagTables/v140_CSharp.json

@@ -477,21 +477,21 @@
     "flags": []
   },
   {
-    "name":  "NoStandardLib",
+    "name":  "NoStdLib",
     "switch": "nostdlib",
     "comment": "",
     "value": "true",
     "flags": []
   },
   {
-    "name":  "NoStandardLib",
+    "name":  "NoStdLib",
     "switch": "nostdlib-",
     "comment": "",
     "value": "false",
     "flags": []
   },
   {
-    "name":  "NoStandardLib",
+    "name":  "NoStdLib",
     "switch": "nostdlib+",
     "comment": "",
     "value": "true",

Templates/MSBuild/FlagTables/v141_CSharp.json

@@ -477,21 +477,21 @@
     "flags": []
   },
   {
-    "name":  "NoStandardLib",
+    "name":  "NoStdLib",
     "switch": "nostdlib",
     "comment": "",
     "value": "true",
     "flags": []
   },
   {
-    "name":  "NoStandardLib",
+    "name":  "NoStdLib",
     "switch": "nostdlib-",
     "comment": "",
     "value": "false",
     "flags": []
   },
   {
-    "name":  "NoStandardLib",
+    "name":  "NoStdLib",
     "switch": "nostdlib+",
     "comment": "",
     "value": "true",

Templates/MSBuild/FlagTables/v142_CSharp.json

@@ -495,21 +495,21 @@
     "flags": []
   },
   {
-    "name":  "NoStandardLib",
+    "name":  "NoStdLib",
     "switch": "nostdlib",
     "comment": "",
     "value": "true",
     "flags": []
   },
   {
-    "name":  "NoStandardLib",
+    "name":  "NoStdLib",
     "switch": "nostdlib-",
     "comment": "",
     "value": "false",
     "flags": []
   },
   {
-    "name":  "NoStandardLib",
+    "name":  "NoStdLib",
     "switch": "nostdlib+",
     "comment": "",
     "value": "true",

Templates/MSBuild/FlagTables/v143_CSharp.json

@@ -495,21 +495,21 @@
     "flags": []
   },
   {
-    "name":  "NoStandardLib",
+    "name":  "NoStdLib",
     "switch": "nostdlib",
     "comment": "",
     "value": "true",
     "flags": []
   },
   {
-    "name":  "NoStandardLib",
+    "name":  "NoStdLib",
     "switch": "nostdlib-",
     "comment": "",
     "value": "false",
     "flags": []
   },
   {
-    "name":  "NoStandardLib",
+    "name":  "NoStdLib",
     "switch": "nostdlib+",
     "comment": "",
     "value": "true",