playlist: play and edit should use same width

public/app/features/playlist/partials/playlists.html

@@ -13,7 +13,7 @@
     <thead>
       <th><strong>Name</strong></th>
       <th><strong>Start url</strong></th>
-      <th style="width: 68px"></th>
+      <th style="width: 78px"></th>
       <th style="width: 78px"></th>
       <th style="width: 25px"></th>
     </thead>