Disable EmbedVideo extension

The EmbedVideo extension referenced in the manifest is no longer
compatible with MediaWiki<1.29.0 so remove it from the active
extensions for now (we can add it back after we move to a newer MW
release).

Change-Id: I8865f143019553062f610c4004147150cff438cd

manifests/init.pp

@@ -87,12 +87,6 @@ class mediawiki(
       ]:
     }
 
-    mediawiki::extension { 'EmbedVideo':
-        ensure   => present,
-        source   => 'https://github.com/HydraWiki/mediawiki-embedvideo.git',
-        revision => 'origin/master', # Not from Wikimedia repos :(
-    }
-
     mediawiki::extension { 'strapping':
         type   => 'skin',
         source => 'https://gerrit.wikimedia.org/r/mediawiki/skins/mediawiki-strapping.git',

templates/Settings.php.erb

@@ -303,8 +303,6 @@ $wgMFAutodetectMobileView = true;
 
 require_once( "$IP/extensions/SubPageList3/SubPageList3.php" );
 
-require_once( "$IP/extensions/EmbedVideo/EmbedVideo.php" );
-
 require_once( "$IP/extensions/ReplaceText/ReplaceText.php" );
 $wgGroupPermissions['sysop']['replacetext'] = true;