Revert "Update del to end of test_re_evaluate_generics"

This reverts commit 2630802.

Author: dr-carlos

Lib/test/test_annotationlib.py

@@ -1929,6 +1929,11 @@ def test_fwdref_invalid_syntax(self):
     def test_re_evaluate_generics(self):
         global global_alias
 
+        # If we've already run this test before,
+        # ensure the variable is still undefined
+        if "global_alias" in globals():
+            del global_alias
+
         class C:
             x: global_alias[int]
 
@@ -1941,9 +1946,6 @@ class C:
         global_alias = list
         self.assertEqual(evaluated.evaluate(), list[int])
 
-        # If we run this test again, ensure the type is still undefined
-        del global_alias
-
 
 class TestAnnotationLib(unittest.TestCase):
     def test__all__(self):