iOS: Remove unused signal

Change-Id: I1d949b01f93485a12bd37142cea02f5b96b7acbb
Reviewed-by: Tobias Hunger <tobias.hunger@qt.io>

src/plugins/ios/iosconfigurations.h

@@ -63,9 +63,6 @@ public:
     static Utils::FileName lldbPath();
     static void updateAutomaticKitList();
 
-signals:
-    void updated();
-
 private:
     IosConfigurations(QObject *parent);
     void load();