VS: Remove the /MERGE flag from v143 link flag table

Apply the change from commit a9f99243 (VS: Remove the /MERGE flag from
FlagTables, 2021-06-08, v3.21.0-rc1~58^2) to the v143 flag table.

Templates/MSBuild/FlagTables/v143_Link.json

@@ -1350,15 +1350,6 @@
       "UserValue"
     ]
   },
-  {
-    "name": "MergeSections",
-    "switch": "MERGE:",
-    "comment": "Merge Sections",
-    "value": "",
-    "flags": [
-      "UserValue"
-    ]
-  },
   {
     "name": "LinkKeyFile",
     "switch": "KEYFILE:",