Code review comment for lp:~ahayzen/ubuntu-weather-app/reboot-day-delegate-expand

Yeah it would be best to have only one listitem expanded at a time. I noticed a issue in the background color of the hourly forecast [1], however at the time I wasn't sure if this was a issue in trunk or in this branch. So I fixed it along with some other cleanups in [2]. So ignore that issue while reviewing this branch as merging my branch would fix it.

[1] https://imgur.com/NMRuJvR
[2] https://code.launchpad.net/~nik90/ubuntu-weather-app/homehourly-design-fix/+merge/255412