* [Game] Use native title bar height for ZoneViewWidget close button
Compute title bar height from style (PM_TitleBarHeight) instead of hardcoded 24.0 to align hit box with native close button.
* [Game] Fix ZoneViewWidget title bar height compile errors
Drop the redundant static on the anonymous namespace helper, stop
redeclaring titleBarHeight's parameter and reuse tbh in the fallback
path, and restore the position clamp that still referenced the removed
kTitleBarHeight constant.
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Co-authored-by: Lukas Brübach <Bruebach.Lukas@bdosecurity.de>