message: use import instead of getComponent
diff: @@ -27,6 +27,7 @@ import Modal from './Modal';
  import RoomViewStore from './stores/RoomViewStore';
  import encrypt from "browser-encrypt-attachment";
  import extractPngChunks from "png-chunks-extract";
  +import Spinner from "./components/views/elements/Spinner";
  // Polyfill for Canvas.toBlob API using Canvas.toDataURL
  import "blueimp-canvas-to-blob";
  @@ -400,8 +401,7 @@ export default class ContentMessages {
  }
  if (!this.mediaConfig) { // hot-path optimization to not flash a spinner if we don't need to
  - const Loader = sdk.getComponent("elements.Spinner");
  - const modal = Modal.createDialog(Loader, null, 'mx_Dialog_spinner');
  + const modal = Modal.createDialog(Spinner, null, 'mx_Dialog_spinner');
  await this.ensureMediaConfigFetched();
  modal.close();
  }
  