Improve timer vibration

[DavisNT]

This is a super-simple fix for #391. When timer ends the watch will vibrate until the side button is pressed or a sliding-down movement is made on the screen (maybe there are some more gestures).

[github-actions[bot]]

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[mark9064]

For reference: alternative to #1971

[DavisNT]

@NeroBurner, @mark9064 Could it be possible to review and schedule this super-simple bugfix for 1.16.0 (or maybe even include it in 1.15.0)?

[mark9064]

1.15 is in feature freeze, and I suspect by the time 1.16 rolls around #1971 will probably be merged? If it doesn't move forward though I agree that ringing would be a good improvement