message: Track RT mode once we've retrieved the setting from account data
diff: @@ -161,6 +161,8 @@ export default class MessageComposerInput extends React.Component {
  const isRichtextEnabled = UserSettingsStore.getSyncedSetting('MessageComposerInput.isRichTextEnabled', false);
  + Analytics.setRichtextMode(isRichtextEnabled);
  +
  this.state = {
  // whether we're in rich text or markdown mode
  isRichtextEnabled,
  