Pass fixupSvgString into paint editor

[adroitwhiz]

Depends on scratchfoundation/scratch-svg-renderer#209 and scratchfoundation/scratch-svg-renderer#210

Resolves

• Resolves SVG fixes should be moved to svg-renderer's fix-up-svg scratch-paint#1269

Proposed Changes

This PR passes the fixupSvgString function into the paint editor component.

Reason for Changes

This allows us to call fixupSvgString from the paint editor without it depending on scratch-svg-renderer itself.

Test Coverage

Tested manually

Browser Coverage

Check the OS/browser combinations tested (At least 2)

Mac

• Chrome
• Firefox
• Safari

Windows

• Chrome
• Firefox
• Edge

Chromebook

• Chrome

iPad

• Safari

Android Tablet

• Chrome

Linux

• Firefox

[adroitwhiz]

To those reviewing this: it's here as a prerequisite to scratchfoundation/scratch-paint#1346, which replaces the "fixup SVG string" step in the paint editor with the fixupSvgString function defined in scratch-svg-renderer and used everywhere else. This doesn't touch the VM's asset code, so it should not cause another situation like scratchfoundation/scratch-vm#3026.