eslint: Cut "disable" lines for now-disabled no-await-in-loop.

We disabled this rule for the whole tree in 4fcfb76; so now
we get to delete these lines that disabled it in specific places
it had popped up.

src/events/eventActions.js

@@ -57,7 +57,6 @@ export const startEventPolling = (queueId: number, eventId: number) => async (
 
   const backoffMachine = new BackoffMachine();
 
-  /* eslint-disable no-await-in-loop */
   // eslint-disable-next-line no-constant-condition
   while (true) {
     const auth = tryGetAuth(getState());

src/outbox/outboxActions.js

@@ -101,7 +101,7 @@ export const sendOutbox = () => async (dispatch: Dispatch, getState: GetState) =
   dispatch(toggleOutboxSending(true));
   const backoffMachine = new BackoffMachine();
   while (!trySendMessages(dispatch, getState)) {
-    await backoffMachine.wait(); // eslint-disable-line no-await-in-loop
+    await backoffMachine.wait();
   }
   dispatch(toggleOutboxSending(false));
 };

src/typing/clearTypingNotification.js

@@ -7,7 +7,6 @@ import { getTyping } from '../directSelectors';
 
 export const clearTypingNotification = () => async (dispatch: Dispatch, getState: GetState) => {
   // loop to auto dismiss typing notifications after typingNotificationTimeout
-  /* eslint-disable no-await-in-loop */
   // eslint-disable-next-line no-constant-condition
   while (true) {
     await sleep(15000);