This PR fixes a bug that was introduced by #3223. There was a code path
that normally used to never run (a blur event running when the shape was
no longer editing) but which was being run now that shapes aren't
immediately removed on pointer down.
### Change Type
- [x] `sdk` — Changes the tldraw SDK
- [x] `bugfix` — Bug fix
### Test Plan
1. Create a sticky note
2. Begin editing the note
3. click on the canvas
4. You should be in pointing_canvas
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