atspi: do not demote an object that repeats event.

atspi: do not demote an object that repeats event.

   If an object is registered to elm_access, then do not demote its order even
   though the object repeats event(repeat_events: 1) when _sort_by_repeat_events
   function sorts object order.

   User could add a rectangle to give accessibility. If the rectangle does not
   repeat events, then it would be a problem when screen reader is off.

   atspi: fix compare func to find object at point
      The compare function(_sort_by_repeat_events) does not change if two objects
      repeat event(repeat_events: 1) even though the second object is registered to
      elm_access. In this case the object could be demoted in the list, and it is not
      possilbe to find the object by screen reader.
      The following is the problem case:
      [Before Sorting]
      1. Object A (repeat_events: 1)
      2. Object B (repeat_events: 1, is registred to elm_access)
      3. Object C (repeat_events: 1)
      4. Object D (repeat_events: 0)
      5. Object E (repeat_events: 0)
      [After Sorting] D - E - A - B -C

      commit: 13c423e081c9ee3c1cac4a1d621479d421dd9294

Change-Id: I9348a10cdd3fde93c4a833b535c1c50cc7a859c5