Enter text in TextInputForm.spec.ts

[dskloetd]

Motivation

The required attribute on input elements is not enforced in unit tests.
But after updating to Svelte 5 and related dependency updates, it is required.
This causes TextInputForm.spec.ts to fail because it tries to submit a form without required input.

Changes

1. Enter some text before trying to submit the form.

Tests

1. Test still passes.
2. Test now also passes in build: svelte v5 #6020

Todos

• Add entry to changelog (if necessary).
  not necessary

[yhabib]

Thanks

[peterpeterparker]

Thanks