fix: Update screenshot plugin for compatibility with CSS vars. #2472
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The basics
The details
Resolves
Fixes the screenshot plugin to be compatible with the changes in google/blockly#8671 which fixes google/blockly#8272
Proposed Changes
It copies the inline style of the injection div to the screenshot svg.
Reason for Changes
The injection div's inline style uses CSS variables to link to the SVG filters that might be used by the blocks in the screenshot.
Test Coverage
No new tests but I manually tested taking screenshots while linking to blockly rc/v12.0.0.
Documentation
N/A
Additional Information
This change isn't necessary until Blockly v12.0.0 is released, but it's compatible with existing Blockly so we might as well fix it now.