elm_win: fix keygrab bug to use wrong keygrab mode
elm_win: fix keygrab bug to use wrong keygrab mode

The code set worng ecore_x_keygrab mode according keygrab mode.
and changed some codes for readablity.

rvandegrift/elementary,tasn/elementary,rvandegrift/elementary,tasn/elementary,tasn/elementary,rvandegrift/elementary,tasn/elementary,tasn/elementary,FlorentRevest/Elementary,rvandegrift/elementary,FlorentRevest/Elementary,FlorentRevest/Elementary,FlorentRevest/Elementary