util.py fix had typo

I dropped a parens on previous code, the correct version which I just  
copied and pasted from a working version is:


def main_is_frozen():
     if sys.platform == 'darwin':
         # this is a temporary hack for bundlebuilder
         return not (sys.executable.endswith('Resources/Python.app/ 
Contents/MacOS/Python'))
     else:
         return (hasattr(sys, "frozen") or # new py2exe, McMillan
                 hasattr(sys, "importers") # old py2exe
                 or imp.is_frozen("__main__")) # tools/freeze, cx_freeze


Sorry for the earlier mistake,

ka

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