Remove unused plates.shrinkcb config variable

Author: amorison

stagpy/config.py

@@ -181,9 +181,6 @@ def _index_collection(arg):
                            'activate Colin\'s version with vz checking')),
     ('timeprofile', switch_opt(False, None,
                                'nb of plates as function of time')),
-    ('shrinkcb',
-        Conf(0.5, False, None, {},
-             True, 'color bar shrink factor')),
     ('zoom',
         Conf(None, True, None, {'type': float},
              False, 'zoom around surface')),