Refactoring: merge video-watch scope into common.

In order to be able to use lit in videowatch related code, we have to
merge these scopes.

package.json

@@ -9,12 +9,6 @@
   },
   "bugs": "https://github.com/JohnXLivingston/peertube-plugin-livechat/issues",
   "clientScripts": [
-    {
-      "script": "dist/client/videowatch-client-plugin.js",
-      "scopes": [
-        "video-watch"
-      ]
-    },
     {
       "script": "dist/client/common-client-plugin.js",
       "scopes": [