Update to exit 1 on failure rollback

Signed-off-by: Riddhesh Sanghvi <[email protected]>

Author: mrrobot47

src/site-type/HTML.php

@@ -454,6 +454,6 @@ protected function rollback() {
 		}
 
 		\EE::success( 'Rollback complete. Exiting now.' );
-		exit;
+		exit( 1 );
 	}
 }