Release wakelock when timer Reset is pressed so screen will go to sleep

[SteveAmor]

Fixes #2419
Tested on watch hardware

[github-actions]

Build size and comparison to main:

Section	Size	Difference
text	385232B	0B
data	944B	0B
bss	22640B	0B

Run in InfiniEmu

[mark9064]

I'm wondering if this should be in the Reset() function instead. But I think this might be more correct, the wakelock should release on the transition from ringing <10s to >10s, and also from ringing <10s to stopped / reset.

[SteveAmor]

I'm still not really sure if it should go in Reset() or not. There were a few reasons I put it where it is. First was so that it was very clear what is happening, second was to save unnecessarily releasing the wakelock when other functions call Reset() but the release is not strictly required, and the third was that I didn't spot any refactoring that would result in a reduction in program size to move it to Reset().
Happy to move to Reset() if my thought process is flawed/not a good design etc.