Jonas Jenwald 1cbcb89dac Fix unreferenced CSS variables (PR 17533 follow-up)
The latest mozilla-central update has test failures, because some CSS variables are not "properly" referenced; in particular:
 - Give `--hcm-highlight-selected-filter` a default value, of `none`, similar to the previously existing HCM filter.
 - Remove the `--mix-blend-mode` variable, since it's unused.
2024-01-25 09:43:20 +01:00
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