efl_ui_item: remove sizing eval code

i do not know why this code is there. But the same code is called in
layout itself, additionally this results in way less calls for
calculating the minsize (Not sure why).

Reviewed-by: Mike Blumenkrantz <michael.blumenkrantz@gmail.com>
Differential Revision: https://phab.enlightenment.org/D9425

src/lib/elementary/efl_ui_item_private.h

@@ -10,7 +10,6 @@ typedef struct _Efl_Ui_Item_Data
 
    // Boolean Data
    Eina_Bool  selected : 1; /* State for item selected */
-   Eina_Bool  needs_size_calc : 1; /* Flag for Size calculation */
 } Efl_Ui_Item_Data;