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/entities/list.blade.php

@@ -5,7 +5,7 @@
         @endforeach
     </div>
 @else
-    <p class="text-muted empty-text">
+    <p class="text-muted empty-text pb-l mb-none">
         {{ $emptyText ?? trans('common.no_items') }}
     </p>
 @endif