fix parsing in performance tests

Author: Jouramie

worlds/stardew_valley/test/performance/TestPerformance.py

@@ -61,7 +61,7 @@ def setUpClass(cls) -> None:
 
         fill_tests_key = "fill"
         if fill_tests_key in os.environ:
-            cls.skip_fill = not bool(os.environ[fill_tests_key])
+            cls.skip_fill = os.environ[fill_tests_key] != "True"
 
         fixed_seed_key = "fixed_seed"
         if fixed_seed_key in os.environ: