message: Add error popup if screen sharing fails
diff: @@ -192,6 +192,11 @@ function _onAction(payload) {
  if (screenCapErrorString) {
  _setCallState(undefined, newCall.roomId, "ended");
  console.log("Can't capture screen: " + screenCapErrorString);
  + const ErrorDialog = sdk.getComponent("dialogs.ErrorDialog");
  + Modal.createDialog(ErrorDialog, {
  + title: "Unable to capture screen",
  + description: screenCapErrorString
  + });
  return;
  }
  newCall.placeScreenSharingCall(
  