Fix key codes on mac.

Qt key codes match the unicode character in upper case format.

Change-Id: I92b43463921e71f2607e569ba7ee23d6f844c50a
Reviewed-by: Morten Johan Sørvig <morten.sorvig@nokia.com>

src/plugins/platforms/cocoa/qcocoahelpers.mm

@@ -264,7 +264,7 @@ Qt::Key qt_mac_cocoaKey2QtKey(QChar keyCode)
 {
     const KeyPair *i = qBinaryFind(entries, end, keyCode);
     if (i == end)
-        return Qt::Key(keyCode.unicode());
+        return Qt::Key(keyCode.toUpper().unicode());
     return i->qtKey;
 }