Add app closing behavior setting

ui/component/settingClosingBehavior/index.js

@@ -0,0 +1,15 @@
+import { connect } from 'react-redux';
+import { SETTINGS } from 'lbry-redux';
+import { doSetAppToTrayWhenClosed } from 'redux/actions/settings';
+import { makeSelectClientSetting } from 'redux/selectors/settings';
+import SettingClosingBehavior from './view';
+
+const select = state => ({
+  toTrayWhenClosed: makeSelectClientSetting(SETTINGS.TO_TRAY_WHEN_CLOSED)(state),
+});
+
+const perform = dispatch => ({
+  setToTrayWhenClosed: value => dispatch(doSetAppToTrayWhenClosed(value)),
+});
+
+export default connect(select, perform)(SettingClosingBehavior);