Get comment author from the comment user_id field

Updates the get_comment_author function to retrieve the comment author
ID from the "user_id" field of the comment rather than assuming the
current user is the author of the comment.

connectors/class-connector-comments.php

@@ -194,8 +194,8 @@ public function get_comment_author( $comment, $field = 'id' ) {
 			$user_name = isset( $user->display_name ) ? $user->display_name : $comment->comment_author;
 		}
 
-		if ( $req_user_login ) {
-			$user      = wp_get_current_user();
+		if ( $req_user_login && isset( $comment->user_id ) ) {
+			$user      = get_user_by( 'id', $comment->user_id );
 			$user_id   = $user->ID;
 			$user_name = $user->display_name;
 		}