[stable25] fix admin-disabled background and user pristine theming settings #36394
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Summary
Only for 25, because it's a mess and we fixed in 26 already
Reproducing the issue:
Checklist
Tests (unit, integration, api and/or acceptance) are includedScreenshots before/after for front-end changesDocumentation (manuals or wiki) has been updated or is not requiredBackports requested where applicable (ex: critical bugfixes)