shouldn't be attempting to re-register vscode's commands (#1893)

Author: bobbrow

Extension/package.json

@@ -436,14 +436,6 @@
         "title": "Toggle Inactive Region Colorization",
         "category": "C/Cpp"
       },
-      {
-        "command": "workbench.action.gotoSymbol",
-        "title": "Go to Symbol in File..."
-      },
-      {
-        "command": "workbench.action.showAllSymbols",
-        "title": "Go to Symbol in Workspace..."
-      },
       {
         "command": "C_Cpp.ShowReleaseNotes",
         "title": "Show Release Notes",