Allow clearing the wizards path

The QmlDesigner now depends on the CppEditor plugin
and the CppEditor plugin enables most of the C++
related wizards.

The easiest solution is to simply clear the wizard
paths before setting the QDS specific path.

Change-Id: I7ee6c84693053e6ad32ec28a6cf262dee615992f
Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org>
Reviewed-by: Eike Ziller <eike.ziller@qt.io>

src/plugins/projectexplorer/jsonwizard/jsonwizardfactory.h

@@ -51,6 +51,7 @@ class PROJECTEXPLORER_EXPORT JsonWizardFactory : public Core::IWizardFactory
 public:
     // Add search paths for wizard.json files. All subdirs are going to be checked.
     static void addWizardPath(const Utils::FilePath &path);
+    static void clearWizardPaths();
 
     // actual interface of the wizard factory:
     class Generator {