[FIX] barcodes: barcodes working in button in dropdown

On mobile, some barcodes didn't trigger in the picking screens, notably
O-BTN.validate. This is due to the use of parent() to check if the
button is in a dropdown, as parent() only checks one DOM-level upwards.
The button being inside a <ul><li>, we need to check more levels than
one to pass the condition and trigger the button press.

By changing parent() to parents(), the entire chain will be checked, not
just one level, and the button press is correctly triggered.

opw-1860964
closes #25941

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