removed callable connection meta field feature

Author: nikordaris

graphene_sqlalchemy/types.py

@@ -117,9 +117,6 @@ def __init_subclass_with_meta__(cls, model=None, registry=None, skip_registry=Fa
             connection = Connection.create_type('{}Connection'.format(cls.__name__), node=cls)
 
         if connection is not None:
-            if not issubclass(connection, Connection) and hasattr(connection, '__call__'):
-                connection = connection()
-
             assert issubclass(connection, Connection), (
                 "The connection must be a Connection. Received {}"
             ).format(connection.__name__)