Styles: Aligned empty state alignment & consistency

- Fixed inital empty state margins/paddings to be aligned and not differ
when lists are empty.
- Aligned button/action display when viewing empty entities.
- Fixed use of non-existing permission in books for book empty state
  button.

Fixes #4563

resources/views/common/activity-list.blade.php

@@ -8,5 +8,5 @@
         @endforeach
     </div>
 @else
-    <p class="text-muted empty-text">{{ trans('common.no_activity') }}</p>
+    <p class="text-muted empty-text mb-none pb-l">{{ trans('common.no_activity') }}</p>
 @endif