fixed bug with 1d

[odunbar]

Purpose

• Closes get_posterior(mcmc,chain) in 1D throws error #420

Content

• make mean(prior) a 1x1 matrix from a Float

Misc

• I noticed during fixing of this bug, that .dev/climaformat.jl converted [x;;] into [x]. I've created Avoid [x;;] notation in formatted code #422

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• I have read and checked the items on the review checklist.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 94.41%. Comparing base (29beb8b) to head (e0a37fa).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #421   +/-   ##
=======================================
  Coverage   94.41%   94.41%           
=======================================
  Files          11       11           
  Lines        2220     2220           
=======================================
  Hits         2096     2096           
  Misses        124      124           

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[odunbar]

small bug fixed and with new tests so merging