KTitleWidget: Constraint the frame size so it properly aligns
Setting the layout constraint to SetFixedSize makes the frame
adapt to the labels size, fixing the wrong vertical alignment.
Vertical alignment counterpart for plasma/systemsettings!144 (merged).
The change is very subtle, but more noticeable when comparing it with the QML titles (and on gammaray)
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Edited by Ismael Asensio