message: Deflake new edited-event test
  We don't need to send as many padding events as we were; reducing the spam
  speeds up the test and deflakes it.
diff: @@ -108,7 +108,7 @@ describe("Editing", () => {
  // send a load of padding events. We make them large, so that they fill the whole screen
  // and the client doesn't end up paginating into the event we want.
  let i = 0;
  - while (i < 20) {
  + while (i < 10) {
  await bob.sendMessage(room.room_id, mkPadding(i++));
  }
  @@ -127,7 +127,7 @@ describe("Editing", () => {
  cy.log(`Bot user sent edit event ${editEventId}`);
  // ... then a load more padding ...
  - while (i < 40) {
  + while (i < 20) {
  await bob.sendMessage(room.room_id, mkPadding(i++));
  }
  });
  