The modifier is passed to UCKeyTranslate, and we don't need to turn
e.g. Qt::ShiftModifier into both shiftKey and rightShiftKey. One is
enough to map the virtual key to a unicode character.
Change-Id: I33c46c016df03ecf17b5d87885d80a6d581767bc
Reviewed-by: Volker Hilsheimer <volker.hilsheimer@qt.io>