Preview .webm as video instead of audio (#31553).

Patch by Seiei Miyagi.


git-svn-id: http://svn.redmine.org/redmine/trunk@18261 e93f8b46-1217-0410-a6f0-8f06a7374b81

lib/redmine/mime_type.rb

@@ -47,6 +47,7 @@ module Redmine
       'application/javascript' => 'js',
       'application/pdf' => 'pdf',
       'video/mp4' => 'mp4',
+      'video/webm' => 'webm',
     }.freeze
 
     EXTENSIONS = MIME_TYPES.inject({}) do |map, (type, exts)|