efl_ui_layout: set needs_size_calc flag at constructor

efl_ui_layout: set needs_size_calc flag at constructor

Summary:
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.

Test Plan:
1. remove lines that call apis such as content_set, hint_set, text_set
  in radio test on elementary_test

2. observe that radios don't have min size

Reviewers: bu5hm4n, Hermet, zmike

Reviewed By: zmike

Subscribers: cedric, #reviewers, #committers

Tags: #efl

Differential Revision: https://phab.enlightenment.org/D9368