Changed Orientation to Permute

[Jonas-a-Zimmermann]

Removing the depcracted orientation in favour of permute in the cornerplot recipe.
This fixes the ylims issue mentioned JuliaPlots/Plots.jl#5007 and TuringLang/MCMCChains.jl#426 .

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Project coverage is 26.46%. Comparing base (bb65b7c) to head (1c80878).
Report is 2 commits behind head on master.

Files with missing lines	Patch %	Lines
src/cornerplot.jl	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #564      +/-   ##
==========================================
- Coverage   26.52%   26.46%   -0.06%     
==========================================
  Files          20       20              
  Lines        1248     1247       -1     
==========================================
- Hits          331      330       -1     
  Misses        917      917              

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