[effects] Add type property to StartupFeedback Effect

Allows to read the configured type in support information.

effects/startupfeedback/startupfeedback.h

@@ -33,6 +33,7 @@ class StartupFeedbackEffect
     : public Effect
 {
     Q_OBJECT
+    Q_PROPERTY(int type READ type)
 public:
     StartupFeedbackEffect();
     virtual ~StartupFeedbackEffect();
@@ -47,6 +48,10 @@ public:
         return 90;
     }
 
+    int type() const {
+        return int(m_type);
+    }
+
     static bool supported();
 
 private Q_SLOTS: