fix(a11y): Add always visible label when setting weather address

[Pytal]

• For [BITV] 9.3.3.2/2.2 - Set location for weather - The input field "Set custom address" does not have a visible label, and adjacent elements do not explain the function. (1) #37084

Summary

Before	After

Checklist

• Code is properly formatted
• Sign-off message is added to all commits
• Tests (unit, integration, api and/or acceptance) are included
• Screenshots before/after for front-end changes
• Documentation (manuals or wiki) has been updated or is not required
• Backports requested](https://github.com/nextcloud/backportbot/#usage) where applicable (ex: critical bugfixes)