Can't add login source

[zeripath]

• Gitea version (or commit ref): v1.16.0-dev-44-gd717c692f
• Can you reproduce the bug at https://try.gitea.io:
  • Yes (provide example URL)
  • No: requires admin access
• Log gist:
  <None relevant>

Description

#16199 unfortunately has broken the add login source page.

The bug appears to relate to String() method on the types - meaning that UI isn't getting the integer to run its test on.