Joystick: Change from foreach to c++11 for

Signed-off-by: Patrick José Pereira <patrickelectric@gmail.com>

src/Joystick/JoystickManager.cc

@@ -153,7 +153,7 @@ QVariantList JoystickManager::joysticks(void)
 {
     QVariantList list;
     
-    foreach (const QString &name, _name2JoystickMap.keys()) {
+    for (const QString &name: _name2JoystickMap.keys()) {
         list += QVariant::fromValue(_name2JoystickMap[name]);
     }