Wizards: Do not list plugins in available feature set

This information is only available via pluginFeatures() now.

Change-Id: I4945933288e492578dafc2600eb8f77f0ee43cb3
Reviewed-by: Eike Ziller <eike.ziller@theqtcompany.com>

src/plugins/coreplugin/iwizardfactory.cpp

@@ -338,7 +338,7 @@ FeatureSet IWizardFactory::pluginFeatures() const
 
 FeatureSet IWizardFactory::availableFeatures(const QString &platformName) const
 {
-    FeatureSet availableFeatures = pluginFeatures();
+    FeatureSet availableFeatures;
 
     foreach (const IFeatureProvider *featureManager, s_providerList)
         availableFeatures |= featureManager->availableFeatures(platformName);