HFP-3448 Fix Vimeo URL regexp case sensitivity

The optional `channels` and `groups` parts are in fact characters so the
matching must be case sensitive.

Author: Languafe

scripts/h5peditor-av.js

@@ -686,7 +686,7 @@ H5PEditor.widgets.video = H5PEditor.widgets.audio = H5PEditor.AV = (function ($)
     },
     {
       name: 'Vimeo',
-      regexp: /^.*(vimeo\.com\/)((channels\/[A-z]+\/)|(groups\/[A-z]+\/videos\/))?([0-9]+)/i,
+      regexp: /^.*(vimeo\.com\/)((channels\/[A-z]+\/)|(groups\/[A-z]+\/videos\/))?([0-9]+)/,
       aspectRatio: '16:9',
     }
   ];