WPDB: When attempting to fall back to ext/mysql in db_connect(), return the result of the fall back.

While it doesn't affect Core, we should also be passing the `$allow_bail` parameter, for anything that uses it differently.

Props markoheijnen, johnbillion.

Fixes #33105.



git-svn-id: https://develop.svn.wordpress.org/trunk@34478 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-includes/wp-db.php

@@ -1474,7 +1474,7 @@ class wpdb {
 
 				if ( $attempt_fallback ) {
 					$this->use_mysqli = false;
-					$this->db_connect();
+					return $this->db_connect( $allow_bail );
 				}
 			}
 		} else {