Fixed minor EXT-2993 (bug voice control window should have valid minimal & maximal size).

Maximal size was not set, because there are no any floaters which have it.

--HG--
branch : product-engine

indra/newview/skins/default/xui/en/floater_voice_controls.xml

 <?xml version="1.0" encoding="utf-8" standalone="yes" ?>
 <floater
  can_resize="true"
- height="300"
+ height="270"
  layout="topleft"
+ min_height="146"
+ min_width="190"  
  name="floater_voice_controls"
  title="Voice Controls"
  save_visibility="true"