qt: fix `isDark` being uninitialized with system palette

Request review @chub.

mentioned in merge request !7054 (merged)

added 1 commit

• 8509d170 - qt: set `isDark` initially with system palette in `SystemPalette`

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added MRStatus::Reviewable label

changed milestone to %4.0

added Component::Interface: Qt label

requested review from @chub

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approved this merge request

added MRStatus::Acceptable label and removed MRStatus::WaitingForReviewerFeedback label

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added 27 commits

• 8509d170...3b4b8809 - 26 commits from branch videolan:master
• d7d20f73 - qt: set `isDark` initially with system palette in `SystemPalette`

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enabled an automatic merge when all merge checks for d7d20f73 pass

merged