ShortcurConflict5 Fix "Invalid arguments for the Wizard widget"

UI.OpenDialog(
  Opt("defaultsize"),
  Wizard("back", "&Back", "abort", "&Abort", "next", "&Next")

errors out with "Invalid arguments for the Wizard widget"

we should be using Symbol("back") etc. as is used in Wizard1.py

ShortcutConflics5.rb just uses ':back' (which is equiv to
Symbol("back"))

Signed-off-by: Noel Power <noel.power@suse.com>

examples/ShortcutConflict5.py

@@ -14,7 +14,7 @@ class ShortcutConflict5Client:
     def main(self):
       UI.OpenDialog(
         Opt("defaultsize"),
-        Wizard("back", "&Back", "abort", "&Abort", "next", "&Next")
+        Wizard(Symbol("back"), "&Back", Symbol("abort"), "&Abort", Symbol("next"), "&Next")
       )
 
       fields = HBox(