Feature Improvement Request - Add Option to Retain Time Spent when Stopping a Set

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Summary

As a Pomorello user, I want the option to retain time spent when I click "Cancel Set" under "Stop a Set' so that I don't lose record of the time I've spent.

A/C

1. When "Cancel Set" is clicked, user is prompted: Retain time spent?
2. Prompt contains Yes and No options
3. If Yes, set is canceled and previous ACTIVITY SUMMARY value is increased by however much time elapsed in the set
4. If No, set is cancelled and previous ACTIVITY SUMMARY value remains the value it was before the set was started

Notes

1. This will give users the opportunity to record time spent on a set when the set is completed faster than scheduled / expected.
2.