genlist: remove annoying error message
Summary:
content couldn't be always a elm widget.
After checking whether it's elm widget or not, use widget API
Test Plan:
terminology -> options -> font -> select font and check below error message
ERR<25935>:eo lib/eo/eo.c:603 _eo_call_resolve() in elm_widget.eo.c:8: you called func 'elm_obj_widget_focus_get' (213) which is unknown in class 'Edje_Object'.
Reviewers: raster, cedric, seoz, Hermet
Reviewed By: Hermet
Subscribers: seoz
Differential Revision: https://phab.enlightenment.org/D1186