Increase core start seconds

[wendevlin]

Proposed change

• increase ASSUME_CORE_START_SECONDS in landing page to 60 seconds

Type of change

• Dependency upgrade
• Bugfix (non-breaking change which fixes an issue)
• New feature (thank you!)
• Breaking change (fix/feature causing existing functionality to break)
• Code quality improvements to existing code or addition of tests

Example configuration

Additional information

• This PR fixes or closes issue: fixes #
• This PR is related to issue or discussion:
• Link to documentation pull request:

Checklist

• The code change is tested and works locally.
• There is no commented out code in this PR.
• Tests have been added to verify that the new code works.

If user exposed functionality or configuration variables are added/changed:

• Documentation added/updated for www.home-assistant.io

[sairon]

For the public record, in my testing on RPi 5, the handover usually took around 30 seconds, sometimes less, sometimes more - in that case errors were shown. I tested it on Pi 3 as well, where it was around 40-50 seconds, so hopefully 60 should be good 🤞