even if there is a min definition on theme for some object,
the objects don't have the min size if we do nothing after creating it.
elm_layout_sizing_eval will return with doing nothing while executing contructor
so that _sizing_eval in _layout_group_calculate will never be invoked without calling hint_set, text_set, content_set, etc.
this patch modifies a initial state of needs_size_calc flag
so that object will doing _sizing_eval after executing constructor.