Sketch ArcAngle constraint fix

[lorenzncode]

• Update cost function

[codecov]

Codecov Report

Merging #932 (e703925) into master (84edaf5) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #932   +/-   ##
=======================================
  Coverage   96.05%   96.05%           
=======================================
  Files          39       39           
  Lines        9162     9162           
  Branches     1107     1107           
=======================================
  Hits         8801     8801           
  Misses        209      209           
  Partials      152      152           

Impacted Files	Coverage Δ
cadquery/occ_impl/sketch_solver.py	91.14% <100.00%> (ø)
tests/test_sketch.py	100.00% <100.00%> (ø)

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[jmwright]

Thanks @lorenzncode !