gengrid: avoid call select callback twice in mode ELM_OBJECT_MULTI_SELECT_MODE_WITH_C...

gengrid: avoid call select callback twice in mode ELM_OBJECT_MULTI_SELECT_MODE_WITH_CONTROL

If multi select mode is ELM_OBJECT_MULTI_SELECT_MODE_WITH_CONTROL and
user code try unselect a item and select another part which not
realized select callback calls twice in this case. For avoid this no
needs focus newly selected item.

@fix