delete stray error screen css import (#3683)

Removes a stray .css import from #3673 , which created some precedence
issues

### Change Type

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- [ ] `sdk` — Changes the tldraw SDK
- [x] `dotcom` — Changes the tldraw.com web app
- [ ] `docs` — Changes to the documentation, examples, or templates.
- [ ] `vs code` — Changes to the vscode plugin
- [ ] `internal` — Does not affect user-facing stuff

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- [x] `bugfix` — Bug fix
- [ ] `feature` — New feature
- [ ] `improvement` — Improving existing features
- [ ] `chore` — Updating dependencies, other boring stuff
- [ ] `galaxy brain` — Architectural changes
- [ ] `tests` — Changes to any test code
- [ ] `tools` — Changes to infrastructure, CI, internal scripts,
debugging tools, etc.
- [ ] `dunno` — I don't know


### Test Plan

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2.

- [ ] Unit Tests
- [ ] End to end tests

### Release Notes

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apps/dotcom/src/components/StoreErrorScreen.tsx

@@ -1,6 +1,5 @@
 import { TLIncompatibilityReason } from '@tldraw/tlsync'
 import { exhaustiveSwitchError } from 'tldraw'
-import 'tldraw/tldraw.css'
 import { RemoteSyncError } from '../utils/remote-sync/remote-sync'
 import { ErrorPage } from './ErrorPage/ErrorPage'