DEV-43799: Increase the minimum floater size for Search.

Liana and the search team want the minimum size of the search floater
to be such that the web content appears at 650x600 pixels. Users can
resize the window larger, but not smaller, than this limit.

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

@@ -4,8 +4,8 @@
  can_resize="true"
  height="646"
  layout="topleft"
- min_height="140"
- min_width="467"
+ min_height="646"
+ min_width="670"
  name="floater_search"
  help_topic="floater_search"
  save_rect="true"