Remove unused selector.

apostrophe-2/css/editor-blocks.css

@@ -287,9 +287,6 @@ body.gutenberg-editor-page .edit-post-visual-editor .editor-block-list__block:no
 	font-size: 64px;
 }
 
-.rtl .wp-block-paragraph.has-drop-cap:not(:focus)::first-letter {
-}
-
 /* Quote */
 
 .wp-block-quote {