pythongh-129033: Remove dead code in test.support.has_no_debug_ranges() (pythonGH-137379)

(cherry picked from commit 08ce7c6)

Co-authored-by: Victor Stinner <vstinner@python.org>

Author: vstinner

Lib/test/support/__init__.py

@@ -541,7 +541,6 @@ def has_no_debug_ranges():
     except ImportError:
         raise unittest.SkipTest("_testinternalcapi required")
     return not _testcapi.config_get('code_debug_ranges')
-    return not bool(config['code_debug_ranges'])
 
 def requires_debug_ranges(reason='requires co_positions / debug_ranges'):
     return unittest.skipIf(has_no_debug_ranges(), reason)