Revert "set initial PYTHONCOERCECLOCALE"

This reverts commit 78525d16f842104ab33aa1dac2ef2691a07e18fa.

Author: WolframAlph

Lib/test/test_cmd_line.py

@@ -242,7 +242,7 @@ def test_undecodable_code(self):
             undecodable = b"\xff"
             # Use C locale to get ascii for the locale encoding
             env['LC_ALL'] = 'C'
-            env['PYTHONCOERCECLOCALE'] = '0'
+            env['PYTHONCOERCECLOCALE'] = '1'
             code = (
                 b'import locale; '
                 b'print(ascii("' + undecodable + b'"), '