Update dispatcher to have only the right JS inits.

app/assets/javascripts/dispatcher.js

@@ -323,7 +323,6 @@ import RepoBundle from './repo/repo_bundle';
           new GroupAvatar();
           break;
         case 'projects:tree:show':
-          shortcut_handler = new ShortcutsNavigation();
           new RepoBundle();
           break;
         case 'projects:find_file:show':

app/assets/stylesheets/pages/tree.scss

@@ -13,7 +13,7 @@
   }
 
   .add-to-tree {
-    vertical-align: top;
+    vertical-align: middle;
     padding: 6px 10px;
   }