Grocycodes for stock items not always working

[piotrekoo]

For most of the items I keep in Grocy, I printed labels with Grocycodes that include stock IDs. Support for grocycodes has been added in #44, but something's wrong.

When I first scan an item, the Stock entry field is left empty. If I cancel and scan the barcode again, the field is populated correctly. I assume the app should do it on the first try.

[supergeorg]

Well, this could be due to slow loading. I changed a fair bit around the consume forms, expect an update next week (with compatibility for the new iOS) and report if it still happens.