Enable TCPStore fixed slow test (#52511)

Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/52511

Re-enable a test that was previously fixed but forgot to be re-enabled.

Test Plan: Imported from OSS

Reviewed By: bdhirsh

Differential Revision: D26586980

Pulled By: H-Huang

fbshipit-source-id: 3cfe21de09036d2b87273680dae351e20125e815
diff --git a/test/distributed/test_c10d.py b/test/distributed/test_c10d.py
index 9ecd628..6abe5fb 100755
--- a/test/distributed/test_c10d.py
+++ b/test/distributed/test_c10d.py
@@ -51,7 +51,6 @@
     CONNECT_TIMEOUT,
     TEST_WITH_TSAN,
     IS_WINDOWS,
-    slowTest,
 )
 
 
@@ -339,8 +338,6 @@
         self.assertEqual(b"value1", fs.get("key1"))
         self.assertEqual(b"value2", fs.get("key4"))
 
-    # https://github.com/pytorch/pytorch/issues/46064 <- takes 5+ min to finish
-    @slowTest
     def test_numkeys_delkeys(self):
         self._test_numkeys_delkeys(self._create_store())