Fix Standby.py

Screen <class 'Screens.Standby.StandbySummary'>((<class 'Screens.Standby.Standby'>,), {}): <type 'exceptions.IOError'>
Traceback (most recent call last):
  File "/usr/lib/enigma2/python/mytest.py", line 227, in create
    return screen(self, *arguments, **kwargs)
  File "/usr/lib/enigma2/python/Screens/Standby.py", line 186, in __init__
IOError: [Errno 2] No such file or directory: '/usr/share/enigma2/lcd_skin/clock_lcd_analog.xml'