Backport: remove invalid CSS. Fixes #3444 #3454
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(max-width: ) { ... }(without a value specified) is not valid syntax, but it's currently getting written into the compiled CSS in Blacklight 8. The offending block was removed frommainin d7416f4 which I've cherry-picked here. I think it's worth backporting to 8.x since it 1) is a small, isolated commit; 2) fixes a bug that affects at least some CSS preprocessor tooling. See #3444 for details.