fix: revert SystemExit re-raise in run_mapper fixture

Author: nikolay-e

tests/conftest.py

@@ -114,9 +114,7 @@ def _run(args):
                 main()
                 return True
             except SystemExit as e:
-                if e.code == 0:
-                    return True
-                raise
+                return e.code == 0
 
     return _run