Describe the bug
When switching between a 12-hour and 24-hour clock on an iOS device, the hour labels in the hourly forecast don't update until they are re-rendered (i.e. by tapping on them).

To Reproduce
Steps to reproduce the behavior:

1. Go to the Now screen.
2. Switch your device to use either 12 or 24-hour clock.
3. Return to the app.
4. See error.

*Expected behavior

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