elm: Move calls to efl_destructor(efl_super()) to the end

elm: Move calls to efl_destructor(efl_super()) to the end

When destroying any object, its parent class destructor should
be called after the subclass destructor has been called. Only
some extremely limited work may be done after the super call.

This commit makes sure that all efl_destructor() overrides in
elementary are doing operations in the right order.

Also, remove a return void.