Inline Comments: Refine selector.

FEE duplicates the content for use with TinyMCE.  So to avoid IC's comment
bubbles rendering twice, add the ':visible' selector.

See related commit cbcabcf.

See #1.

includes/hooks-inline-comments.php

@@ -34,7 +34,7 @@ function cacsp_ic_modify_selector( $retval ) {
 		return $retval;
 	}
 
-	return '.entry-content p';
+	return '.entry-content p:visible';
 }
 add_filter( 'option_multiselector', 'cacsp_ic_modify_selector' );