efl_ui_layout: remove group_calcualte to respect legacy min size

efl_ui_layout: remove group_calcualte to respect legacy min size

Summary:
For legacy elm_layout, the size should be calculated based on
`hint_size_combined_min` instead of `hint_size_min` in the group_calculate.

Also, `_efl_ui_layout_efl_canvas_group_group_calculate` is unnecessary because
it is added to allow finger size policy differentiation between inherited layout
and layout object (see also, 46cf288d32f06a0c82ef227c65e55062bf494672), however,
it can be set by `finger_size_multiplier` proeprty in constructor.

Test Plan:
Check `evas_object_size_hint_min_set` is respected.

layout_example.c
```
//Compile with:
//edje_cc layout_example.edc &&  gcc -g layout_example.c -o layout_example `pkg-config --cflags --libs elementary`
#include <Elementary.h>

EAPI_MAIN int
elm_main(int argc EINA_UNUSED, char **argv EINA_UNUSED)
{
   Evas_Object *win, *layout, *box;

   elm_policy_set(ELM_POLICY_QUIT, ELM_POLICY_QUIT_LAST_WINDOW_CLOSED);

   win = elm_win_util_standard_add("layout", "Layout");
   elm_win_autodel_set(win, EINA_TRUE);

   box = elm_box_add(win);
   evas_object_size_hint_weight_set(box, EVAS_HINT_EXPAND, EVAS_HINT_EXPAND);
   evas_object_size_hint_align_set(box, EVAS_HINT_FILL, EVAS_HINT_FILL);
   evas_object_show(box);
   elm_win_resize_object_add(win, box);

   layout = elm_layout_add(box);
   evas_object_size_hint_min_set(layout, 300, 200);
   elm_layout_file_set(layout, "./layout_example.edj", "mylayout");
   evas_object_show(layout);
   elm_box_pack_end(box, layout);

   evas_object_resize(win, 300, 300);
   evas_object_show(win);

   elm_run();

   return 0;
}
ELM_MAIN()
```

layout_example.edc
```
collections {
   group {
      name: "mylayout";
      parts {
         part {
            name: "bg";
            type: RECT;
            description {
               state: "default" 0.0;
               color: 100 190 100 255;
            }
         }
         part {
            name: "mytext1";
            type: TEXT;
            description {
               state: "default" 0.0;
               text {
                  size: 30;
                  text: "my text1";
                  min: 1 0;
               }
               color: 0 255 0 255;
               rel1.relative: 0.0 0.0;
               rel2.relative: 1.0 0.3;
            }
         }
      }
      parts {
         part {
            name: "mytext2";
            type: TEXT;
            description {
               state: "default" 0.0;
               text {
                  size: 30;
                  text: "my text2";
                  min: 1 0;
               }
               color: 0 255 255 255;
               rel1.relative: 0.0 0.3;
               rel2.relative: 1.0 0.6;
            }
         }
      }
   }
}
```

Reviewers: zmike, Jaehyun_Cho, woohyun

Reviewed By: Jaehyun_Cho

Subscribers: cedric, #reviewers, #committers

Tags: #efl

Differential Revision: https://phab.enlightenment.org/D11858