EMI: Show subtitles of judges during Marco's dive - #6994

- when Marco dives and one of the judges announces the
  dive combination, the subtitles are currently not displayed
- that happens because the judge actor's _visible variable is true,
  "isInSet()" returns true as well and so _mustPlaceText is set to true
- because of that, TextObject::setText is called with
  delaySetup = true which causes the setting of the
  textobject's _lines to be postponed
- since the actor's EffectiveSortOrder is -1, its draw() method
  is never called, the text object is never placed, its _lines stay
  empty and the text is never drawn
- this commit fixes the issue by not setting _mustPlaceText
  when the actor's effective sort order is < 0