Exclude all modifiers as candidates for shortcuts

If we're going to limit shortcuts to non-modifiers, we should
at least include all of the modifiers, otherwise we'll end up
passing through e.g. Key_CapsLock.

Change-Id: If11758f85d06f75e9b9c2d2a57d4a4915ff72317
Reviewed-by: Andy Shaw <andy.shaw@qt.io>

src/gui/kernel/qshortcutmap.cpp

@@ -359,7 +359,7 @@ QKeySequence::SequenceMatch QShortcutMap::nextState(QKeyEvent *e)
     Q_D(QShortcutMap);
     // Modifiers can NOT be shortcuts...
     if (e->key() >= Qt::Key_Shift &&
-        e->key() <= Qt::Key_Alt)
+        e->key() <= Qt::Key_ScrollLock)
         return d->currentState;
 
     QKeySequence::SequenceMatch result = QKeySequence::NoMatch;