EXP-1458 FIX Chat text entry bar does not have focus when chat floater is...

EXP-1458 FIX Chat text entry bar does not have focus when chat floater is opened while chat history is toggled open
made expando-button chrome, so it doesn't steal focus

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

@@ -68,6 +68,7 @@
      image_pressed="ComboButton_UpSelected"
      image_pressed_selected="ComboButton_Selected"
      height="23"
+     chrome="true"
      name="show_nearby_chat"
      tool_tip="Shows/hides nearby chat log">
     </button>