Utils: Remove FileWizard class altogether

This fixes the regression where two Location pages were added
before.

Change-Id: Ic3241d707ad8dcf6fc3063bb4613dce49001e196
Reviewed-by: Orgad Shaneh <orgads@gmail.com>

src/plugins/genericprojectmanager/genericprojectwizard.h

@@ -34,6 +34,8 @@
 #include <coreplugin/basefilewizardfactory.h>
 #include <utils/wizard.h>
 
+namespace Utils { class FileWizardPage; }
+
 namespace GenericProjectManager {
 namespace Internal {