Correctly emit the scroll signal when scrolling an entry @fix T1274.

As the Elm_Entry has replaced the _scroll_cb we need to emit the same signal
(that was the only function of elm_scroller's _scroll_cb)

legacy/elementary/src/lib/elm_entry.c

@@ -4505,6 +4505,9 @@ static void
 _scroll_cb(Evas_Object *obj, void *data EINA_UNUSED)
 {
    ELM_ENTRY_DATA_GET(obj, sd);
+   /* here we need to emit the signal that the elm_scroller would have done */
+   evas_object_smart_callback_call(obj, "scroll", NULL);
+
    if (sd->have_selection)
      _update_selection_handler(obj);
 }