VS: Fix /reference and /headerUnit flag table entries for v142 and v143

These flags accept values in following arguments, not immediately
appended.

Fixes: #22530

Templates/MSBuild/FlagTables/v142_CL.json

@@ -1214,7 +1214,7 @@
     "comment": "Additional Module Dependencies",
     "value": "",
     "flags": [
-      "UserValue",
+      "UserFollowing",
       "SemicolonAppendable"
     ]
   },
@@ -1224,7 +1224,7 @@
     "comment": "Additional Header Unit Dependencies",
     "value": "",
     "flags": [
-      "UserValue",
+      "UserFollowing",
       "SemicolonAppendable"
     ]
   },

Templates/MSBuild/FlagTables/v143_CL.json

@@ -1214,7 +1214,7 @@
     "comment": "Additional Module Dependencies",
     "value": "",
     "flags": [
-      "UserValue",
+      "UserFollowing",
       "SemicolonAppendable"
     ]
   },
@@ -1224,7 +1224,7 @@
     "comment": "Additional Header Unit Dependencies",
     "value": "",
     "flags": [
-      "UserValue",
+      "UserFollowing",
       "SemicolonAppendable"
     ]
   },