This PR prevents a crash when you try to curve an arrow that is pointing
a very small distance.
Fixes#1533
### Change Type
- [x] `patch` — Bug Fix
### Test Plan
1. Draw a line.
2. Draw an arrow from one point on the line to another point on the
line.
3. It might look weird or flicker (that's ok - that's a *different*
issue - we can fix it another time).
4. Move the middle handle of the arrow.
5. It should curve the arrow.
---
1. Open this snapshot link:
https://www.tldraw.com/s/v2_c_LtB3kVSYEyWuR-aCCrrUn
2. Copy its contents onto your own tldraw.
3. Click on the frog.
4. Drag the handle that's on the frog's face.
5. It shouldn't crash the app.
- [ ] Unit Tests
- [ ] Webdriver tests
### Release Notes
- Fixed a rare crash that could happen when you try to curve an arrow
with zero distance.
5d826c926d