Hide call buttons when on call

ts/state/roots/createConversationHeader.tsx

@@ -0,0 +1,14 @@
+import React from 'react';
+import { Store } from 'redux';
+import { Provider } from 'react-redux';
+
+import { SmartConversationHeader, OwnProps } from '../smart/ConversationHeader';
+
+export const createConversationHeader = (
+  store: Store,
+  props: OwnProps
+): React.ReactElement => (
+  <Provider store={store}>
+    <SmartConversationHeader {...props} />
+  </Provider>
+);