Fix import ordering in test_gamescript.py

ruff's isort rules want the openttd import grouped with the other
third-party imports, as the rest of the test suite has it.

Co-Authored-By: Claude <[email protected]>

tests/test_gamescript.py

@@ -11,7 +11,6 @@ import re
 from pathlib import Path
 
 import pytest
-
 from openttd.protocol import GS_BRIDGE_VERSION, GameEventType
 
 ROOT = Path(__file__).resolve().parents[1]