Incorrect "since" time for total insulin

[channemann]

It appears that the time displayed for total insulin (normally for the day since approximately midnight) had a bug.

[loudnate]

This is fixed in LoopKit here: LoopKit/LoopKit@559ead5#diff-f15dc05fbeb2566c8342d34c44f52529R796

Will be included in the next Loop release.