Fix privacy dropdown in boost modal on mobile (#1967)

Fixes #1965

app/javascript/flavours/glitch/features/compose/containers/dropdown_container.js

@@ -0,0 +1,12 @@
+import { connect } from 'react-redux';
+import { isUserTouching } from 'flavours/glitch/is_mobile';
+import { openModal, closeModal } from 'flavours/glitch/actions/modal';
+import Dropdown from '../components/dropdown';
+
+const mapDispatchToProps = dispatch => ({
+  isUserTouching,
+  onModalOpen: props => dispatch(openModal('ACTIONS', props)),
+  onModalClose: () => dispatch(closeModal()),
+});
+
+export default connect(null, mapDispatchToProps)(Dropdown);