message: Fix incorrect liveTimeline reference
  Fixes
diff: @@ -143,6 +143,8 @@ interface ISendMessageComposerProps extends MatrixClientProps {
  @replaceableComponent("views.rooms.SendMessageComposer")
  export class SendMessageComposer extends React.Component<ISendMessageComposerProps> {
  static contextType = RoomContext;
  + public context!: React.ContextType<typeof RoomContext>;
  +
  private readonly prepareToEncrypt?: DebouncedFunc<() => void>;
  private readonly editorRef = createRef<BasicMessageComposer>();
  private model: EditorModel = null;
  @@ -279,7 +281,7 @@ export class SendMessageComposer extends React.Component<ISendMessageComposerPro
  }
  private sendQuickReaction(): void {
  - const timeline = this.context.liveTimeline();
  + const timeline = this.context.liveTimeline;
  const events = timeline.getEvents();
  const reaction = this.model.parts[1].text;
  for (let i = events.length - 1; i >= 0; i--) {
  