Fractures are displayed with "1 0/1" instead of "1" when increasing servings

Description
When the ingredients contain fractures, such as "1/2" and increasing the servings from e.g. 2 to 4 it will add up to 1 but displays "1 0/1". This works for all whole fractures, so 1 0/1, 2 0/1, 3 0/1 and so on

Reproduction
Steps to reproduce the behavior:

1. Create a recipe with an ingredient with amount "1/2" e.g. "1/2 onion" and set the servings to 2
2. Save the recipe
3. Open the recipe and increase the servings to 4
4. See the ingredients

Expected behavior
Ingredients say "1 onion"

Actual behavior
Ingredients say "1 0/1 onion"

Screenshots
1/2 (2 servings)

1 (4 servings)

Browser
Mozilla Firefox for Fedora v137.0 (64 bit)

Versions
Nextcloud server version: 31.0.2
Cookbook version: 0.11.3
Database system: MariaDB

Reproduce the issue with a recipe containing "1/2 onion": save it at 2 servings, increase to 4, and inspect the ingredient display in Firefox. Trace the serving-scaling and fraction-formatting path used by the recipe view; done means whole results display as "1 onion" rather than "1 0/1 onion" while fractional amounts still display correctly.