Fix Sketch rarray bug when used with push

[lorenzncode]

An extra translation is applied when rarray is used with push. Compare with/without push (easy to see with push([(0,0)]).

The form of the parray return statement is correct. I would have liked to add a similar test for parray anyway but did not finish testing it yet.

[codecov]

Codecov Report

Merging #994 (8d4c3ea) into master (ed8e62c) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #994   +/-   ##
=======================================
  Coverage   96.17%   96.17%           
=======================================
  Files          40       40           
  Lines        9292     9293    +1     
  Branches     1109     1109           
=======================================
+ Hits         8937     8938    +1     
  Misses        208      208           
  Partials      147      147           

Impacted Files	Coverage Δ
cadquery/sketch.py	96.25% <ø> (ø)
tests/test_sketch.py	100.00% <100.00%> (ø)

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[adam-urbanczyk]

Thanks @lorenzncode, shall I merge?

[lorenzncode]

Yes, please merge this rarray fix. I don't have any other changes to make to this PR.