kcms/fonts: show warning when user tries to set a non-integer font size
It triggers https://bugreports.qt.io/browse/QTBUG-92006, and we need to warn users about that. CCBUG: 432372
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It triggers https://bugreports.qt.io/browse/QTBUG-92006, and we need to warn users about that. CCBUG: 432372