fix: "range" in range-around z-stack widget starts form 0 (no negative numbers)

[fdrgsp]

fix for #376: set the minimum possible range for the RANGE_AROUND mode to 0 so we do not have negative values.

closes #376

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.71%. Comparing base (d58003b) to head (69967bd).
Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #379   +/-   ##
=======================================
  Coverage   90.71%   90.71%           
=======================================
  Files          85       85           
  Lines        9188     9188           
=======================================
  Hits         8335     8335           
  Misses        853      853           

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