macOS: Map Qt::KeyboardModifier to a single Carbon modifier

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>

src/plugins/platforms/cocoa/qcocoakeymapper.mm

@@ -92,12 +92,9 @@ static CarbonModifiers toCarbonModifiers(Qt::KeyboardModifiers qtModifiers)
 
     static constexpr std::tuple<int, Qt::KeyboardModifier> carbonModifierMap[] = {
         { shiftKey, Qt::ShiftModifier },
-        { rightShiftKey, Qt::ShiftModifier },
         { controlKey, Qt::ControlModifier },
-        { rightControlKey, Qt::ControlModifier },
         { cmdKey, Qt::MetaModifier },
         { optionKey, Qt::AltModifier },
-        { rightOptionKey, Qt::AltModifier },
         { kEventKeyModifierNumLockMask, Qt::KeypadModifier }
     };