message: [Qt] Make CoinControlTreeWidget focusable
  Making this widget focusable allows for using the keyboard to navigate
  and select inputs using the arrow keys and spacebar.
diff: </property>
  <item>
  <widget class="CoinControlTreeWidget" name="treeWidget">
  - <property name="focusPolicy">
  - <enum>Qt::NoFocus</enum>
  - </property>
  <property name="contextMenuPolicy">
  <enum>Qt::CustomContextMenu</enum>
  </property>
  