Remove tabs permission (#2136)

Author: elliette

dwds/debug_extension_mv3/web/manifest_mv2.json

@@ -13,7 +13,6 @@
     "debugger",
     "notifications",
     "storage",
-    "tabs",
     "webNavigation"
   ],
   "background": {

dwds/debug_extension_mv3/web/manifest_mv3.json

@@ -14,7 +14,6 @@
     "notifications",
     "scripting",
     "storage",
-    "tabs",
     "webNavigation"
   ],
   "host_permissions": ["<all_urls>"],