[FIX] barcodes: use patch to prevent interactions between tests

There is a subtle issue happening in tests when we override a widget
property for the duration of the test and try to restore the initial state at
the end by rewriting on the property.  It actually changes the widget, by
having a function bound to the sub widget prototype instead of its ancestor.
This in turns can cause weird interactions with the class system.

We introduced a proper way to temporarily patch a class/widget by adding
a method in testUtils to do exactly that.  This commit simply uses that
method to prevent unwanted interactions in barcode tests

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