Fix stock item form to allow changing backorder value #3159
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Description
This PR fixes a bug on the admin stock item forms that I discovered yesterday, probably introduced in #2862.
The form controls to submit the stock item form was not displayed if the backorder checkbox was the only attribute changed. This is wrong since we could need to change that value without also changing the count on hand value.
This PR fixes this bug by considering also the backorder value changes when we decide if showing the stock item form or not.
Before
After
Checklist: