added gating to sidepanel shortcut

Summary:
Cmd -Shift - G turns out to be some Mac OS command.

Adding a GK for user to disable. In the next diff, will think of a new shortcut to change to.

Reviewed By: evangrayk

Differential Revision: D66476854

fbshipit-source-id: a7cb145553cfc2ad9964e88dcbb8fb979f29ad6a

addons/vscode/package.json

@@ -204,7 +204,7 @@
         "command": "sapling.open-comments",
         "key": "ctrl-shift-g",
         "mac": "cmd-shift-g",
-        "when": "activeWebviewPanelId != 'sapling.comments'"
+        "when": "isl.inlineCommentSidePanelEnabled && activeWebviewPanelId != 'sapling.comments'"
       }
     ],
     "menus": {