Set deployed flag after deploying

Author: hategan

src/psij/launchers/script_based_launcher.py

@@ -110,6 +110,7 @@ def _ensure_launcher_deployed(self) -> None:
 
             deploy_dir = self._deploy_files(self._files_to_deploy())
             self._deployed_script_path = deploy_dir / self._script_path.name
+            self._deployed = True
 
     def _files_to_deploy(self) -> List[Path]:
         return [