Restore limit when searching for searching for wizard name

20cdba7a1bf3 removed the limit but it is still needed to extract the single
record.

Closes #14238

trytond/trytond/ir/action.py

@@ -1109,7 +1109,8 @@ class ActionWizard(
                     ('model', '=', None),
                     ],
                 ],
-            order=[('model', 'ASC NULLS LAST')])
+            order=[('model', 'ASC NULLS LAST')],
+            limit=1)
         if actions:
             action, = actions
             wiz_name = action.name