Fix order of the sl_n and sl_k pointers in ScsCone constructor

[odow]

Looks like it's just a typo from #327, but I still need to make a proper test.

Upstream uses

https://github.com/cvxgrp/scs/blob/35b491dfdead5e4bab595f48f6c9cb2aab868dc5/include/scs.h#L174-L176

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 96.68%. Comparing base (02f2ff4) to head (5cfe74f).

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #360   +/-   ##
=======================================
  Coverage   96.68%   96.68%           
=======================================
  Files          12       12           
  Lines         663      663           
=======================================
  Hits          641      641           
  Misses         22       22           

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[odow]

@araujoms okay with this? Or were you passing the arguments reversed in scs_solve?

[araujoms]

Me? I never used this cone. Change seems correct though.