VS: Remove cl /FS entry from flag table for v142 and v143

The `ForceSynchronousPDBWrites` entry in a `.vcxproj` file does not
actually cause the `/FS` flag to be added to the command line.

Fixes: #22476

Templates/MSBuild/FlagTables/v142_CL.json

@@ -786,13 +786,6 @@
       "Continue"
     ]
   },
-  {
-    "name": "ForceSynchronousPDBWrites",
-    "switch": "FS",
-    "comment": "Force Synchronous PDB Writes",
-    "value": "true",
-    "flags": []
-  },
   {
     "name": "IntrinsicFunctions",
     "switch": "Oi",

Templates/MSBuild/FlagTables/v143_CL.json

@@ -788,13 +788,6 @@
       "Continue"
     ]
   },
-  {
-    "name": "ForceSynchronousPDBWrites",
-    "switch": "FS",
-    "comment": "Force Synchronous PDB Writes",
-    "value": "true",
-    "flags": []
-  },
   {
     "name": "IntrinsicFunctions",
     "switch": "Oi",