[Extensions] Remove more extraneous type definitions in feature files

Some features specified more types than corresponded to the
allowlisted IDs. Remove the unnecessary types. (There may be
more entries with this issue, but these were the ones I saw.)

Bug: None
Change-Id: Ib19bc8691b569127a835edc2a967c2f6ca1082a2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2304957Reviewed-by: Karan Bhatia <karandeepb@chromium.org>
Commit-Queue: Devlin <rdevlin.cronin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#789695}

extensions/common/api/_behavior_features.json

@@ -13,14 +13,14 @@
   "do_not_sync": {
     "channel": "stable",
     "component_extensions_auto_granted": false,
-    "extension_types": "all",
+    "extension_types": ["extension"],
     "whitelist": [
       "226CF815E39A363090A1E547D53063472B8279FA"   // Media Router Stable
     ]
   },
   "zoom_without_bubble": {
     "channel": "stable",
-    "extension_types": "all",
+    "extension_types": ["extension"],
     "whitelist": [
       "CBCC42ABED43A4B58FE3810E62AFFA010EB0349F"   // https://crbug.com/538252
     ]