Workout navigation not work, if workout not start

[zcattacz]

Describe the bug

To Reproduce Steps to reproduce the behavior:

1. Click the start (>) button on work set,
2. Don't click start (>) in workout screen, instead, press left |< or right >| button , until you see the progress bar moved to some arbitrary position
3. You are stuck, keep pressing |< or >| , won't do anything.
4. Pressing system back button to exit exercise screen and re-enter that screen won't fix it.
5. Now press start (>) to start the initial count down (if tick sound is enabled, you will hear tick sound now, which is not consistent without the above operation), after the count down, minutes/seconds digits during the first exercise will use "-" instead of "0" as empty digit place holder.
6. After the timer acted weirdly for the first exercise, one can navigate through the remaining exercises again.

Expected behavior

• The weird timing behavior shouldn't happen
• Exercises should be navigable regardless of the timer state.

Screenshots If applicable, add screenshots to help explain your problem.

Smartphone (please complete the following information):

• OS: Android 9
• Version 1.9.1 f-droid

Additional context Add any other context about the problem here.