[domain] find current day forecast correctly

[triallax]

Description

Fix currentDayForecast detecting the wrong forecast as today's forecast.

Previously, the code would incorrectly compare the forecasts based on the weekdays in UTC time, whereas it should be comparing based on the local time zone of the weather location.

### References Fixes https://github.com/Lacerte/clima/issues/317.

Testing

• [x] This change adds test coverage for new/changed/fixed functionality

@betsythefc can you please test this PR's APK? app-release.apk.zip

You will need to uninstall Clima from your phone before you install this APK, and so will lose your Clima settings in the process. Apologies for that.

Checklist

• [x] The correct base branch is being used, if not master