Only use the hack if we are in safari. Should make it faster for other
browsers.
Based on the suggestion from
https://github.com/tldraw/tldraw/issues/2183
Fixes https://github.com/tldraw/tldraw/issues/2183
### Change Type
- [x] `patch` — Bug fix
- [ ] `minor` — New feature
- [ ] `major` — Breaking change
- [ ] `dependencies` — Changes to package dependencies[^1]
- [ ] `documentation` — Changes to the documentation only[^2]
- [ ] `tests` — Changes to any test code only[^2]
- [ ] `internal` — Any other changes that don't affect the published
package[^2]
- [ ] I don't know
[^1]: publishes a `patch` release, for devDependencies use `internal`
[^2]: will not publish a new version
### Release Notes
- Improve the speed of exporting to png for non Safari browsers.
70a1103107