delete old todo comment (#3777)

follow up to #3695 

### Change Type

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- [ ] `dotcom` — Changes the tldraw.com web app
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- [ ] `bugfix` — Bug fix
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- [ ] `galaxy brain` — Architectural changes
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- [ ] `tools` — Changes to infrastructure, CI, internal scripts,
debugging tools, etc.
- [x] `dunno` — I don't know


### Test Plan

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2.

- [ ] Unit Tests
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packages/tlsync/src/lib/TLSyncClient.ts

@@ -424,9 +424,8 @@ export class TLSyncClient<R extends UnknownRecord, S extends Store<R> = Store<R>
 
 	private pushPresence(nextPresence: R | null) {
 		// make sure we push any document changes first
-		// TODO: need to send presence changes in the same push request as document changes
-		// in order to not get into weird states
 		this.store._flushHistory()
+
 		if (!this.isConnectedToRoom) {
 			// if we're offline, don't do anything
 			return