[fix] Fix timediff output when the result is a negative value (#1113)

[scottnemes]

Description

• Fixes output from the timediff function when the result is a negative time value.

Before:

select timediff('2020-11-11 01:01:01', '2020-11-11 01:02:01');
-1 day, 23:59:00 

After

select timediff('2020-11-11 01:01:01', '2020-11-11 01:02:01');
-00:01:00

Fixes #1113

Checklist

• I've added this contribution to the changelog.md.
• I've added my name to the AUTHORS file (or it's already there).
• I ran uv run ruff check && uv run ruff format && uv run mypy --install-types . to lint and format the code.

[rolandwalker]

Super nice!

[rolandwalker]

@scottnemes if you assign yourself the PR then it will be clear to us that you are handling the merge.