[1.7.x] Fixed #23161: Drop PostGIS geography fields correctly

    def remove_field(self, model, field):

        from django.contrib.gis.db.models.fields import GeometryField

        if not isinstance(field, GeometryField) or self.connection.ops.spatial_version > (2, 0):

        if not isinstance(field, GeometryField) or \

           self.connection.ops.spatial_version > (2, 0) or \

           field.geography:

            super(PostGISSchemaEditor, self).remove_field(model, field)

        else:

            self.execute(