umu_run: fix subreaping when command errors

- Fixes a bug where descendent processes would fail to be reaped in the case the user forcefully terminates the launcher (e.g., control+c). In the event that subprocess.run raises an error due to any failure in the command execution, it would kill Reaper. Therefore, subprocess.run should always silently fail in this case for reaping to occur and the launcher handle non-zero statuses

umu/umu_run.py

@@ -7,7 +7,7 @@
 from typing import Dict, Any, List, Set, Union, Tuple
 from umu_plugins import enable_steam_game_drive, set_env_toml, enable_reaper
 from re import match
-from subprocess import run, CalledProcessError
+from subprocess import run
 from umu_dl_util import get_umu_proton
 from umu_consts import PROTON_VERBS, DEBUG_FORMAT, STEAM_COMPAT, UMU_LOCAL
 from umu_util import setup_umu
@@ -255,7 +255,7 @@ def build_command(
     return command
 
 
-def main() -> None:  # noqa: D103
+def main() -> int:  # noqa: D103
     env: Dict[str, str] = {
         "WINEPREFIX": "",
         "GAMEID": "",
@@ -350,17 +350,18 @@ def main() -> None:  # noqa: D103
     build_command(env, UMU_LOCAL, command, opts)
     log.debug("%s", command)
 
-    return run(command, check=True)
+    return run(command, check=False).returncode
 
 
 if __name__ == "__main__":
     try:
-        main()
+        sys.exit(main())
     except KeyboardInterrupt:
         log.warning("Keyboard Interrupt")
         sys.exit(1)
-    except CalledProcessError:
-        log.exception("CalledProcessError")
+    except SystemExit as e:
+        if e.code != 0:
+            raise Exception(e)
     except Exception:
         log.exception("Exception")
         sys.exit(1)