Use font with same digit width in stopwatch

[ShadyMedic]

Checklist

• [x] I made sure that there are no existing issues - open or closed - to which I could contribute my information.
• [x] I have read the FAQ and my problem isn't listed.
• [x] I have taken the time to fill in all the required details. I understand that the feature request will be dismissed otherwise.
• [x] This issue contains only one feature request.
• [x] I have read and understood the contribution guidelines.

Is your feature request related to a problem? Please describe. It sucks when the elements jump over the screen because the timer changes between being one line long and two lines long.

Describe the solution you'd like Use a font in which all characters (or at least number) are same width.

Describe alternatives you've considered If possible, make the timer font scale according to the current element width, so it always fits one line.

Additional context This is pretty much a transfer of the issue in the base repository: https://github.com/SimpleMobileTools/Simple-Clock/issues/556

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