iOS: Move updateAutomaticKitList() trigger closer to its user

This removes the IosPlugin::kitsRestored() member that does not
fully fit the standard plugin implementation pattern.

Change-Id: Iedd79e5326b85b189673c19e1920e21c34cd03bb
Reviewed-by: Eike Ziller <eike.ziller@qt.io>

src/plugins/ios/iosconfigurations.h

@@ -129,6 +129,7 @@ private:
     IosConfigurations(QObject *parent);
     void load();
     void save();
+    void kitsRestored();
     void updateSimulators();
     static void setDeveloperPath(const Utils::FileName &devPath);
     void initializeProvisioningData();