ZopePatch.py: remove an unused patche.

product/ERP5Type/patches/utils.py

-import sys
-from Products.CMFCore.utils import ImmutableId
-from zLOG import LOG, WARNING
-
-def ImmutableId_setId(self, id):
-  if id == self.getId():
-      raise ValueError('The name has not been changed: %s'
-                       % self.getId())
-  else:
-    self.id = id
-
-ImmutableId._setId = ImmutableId_setId
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