Revert "Do not support package selection and upgrade in Qubes"

This reverts commit 61af4bd9af.

This is now properly covered by 85b30a5f4c.

anaconda/installclasses/qubes.py

@@ -48,10 +48,6 @@ class InstallClass(BaseInstallClass):
 
     bootloaderTimeoutDefault = 5
 
-    # Qubes comes preinstalled and does not support upgrade
-    showPackageSelection = False
-    showUpgrade = False
-
     tasks = [(N_("Minimal"), ["core", "qubes"]),
              (N_("Desktop"),
               ["backup-client", "base", "compat-libraries", "fonts",

anaconda/iw/task_gui.py

@@ -703,4 +703,5 @@ class TaskWindow(InstallWindow):
         self.xml.get_widget("addRepoButton").connect("clicked", self._addRepo)
         self.xml.get_widget("editRepoButton").connect("clicked", self._editRepo, self.rs)
 
-        return vbox
+        #return vbox
+        return None