fixed the sign on mu_star_shell.

[jsitarek]

It was always assuming that the shell is "behind" the blob, i.e. that mu>1, however if the blob is inside the shell, some parts of it will have mu<0

[sourcery-ai]

Sourcery Code Quality Report

❌  Merging this PR will decrease code quality in the affected files by 1.26%.

Quality metrics	Before	After	Change
Complexity	0.00 ⭐	0.00 ⭐	0.00
Method Length	27.20 ⭐	30.60 ⭐	3.40 👎
Working memory	8.58 🙂	8.67 🙂	0.09 👎
Quality	81.76% ⭐	80.50% ⭐	-1.26% 👎

Other metrics	Before	After	Change
Lines	41	47	6

Changed files	Quality Before	Quality After	Quality Change
agnpy/utils/geometry.py	81.76% ⭐	80.50% ⭐	-1.26% 👎

Here are some functions in these files that still need a tune-up:

File	Function	Complexity	Length	Working Memory	Quality	Recommendation
agnpy/utils/geometry.py	cos_psi	0 ⭐	47 ⭐	10 😞	76.97% ⭐	Extract out complex expressions

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[codecov]

Codecov Report

Merging #79 (b70c68f) into master (489f1cc) will increase coverage by 0.01%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master      #79      +/-   ##
==========================================
+ Coverage   93.97%   93.98%   +0.01%     
==========================================
  Files          30       30              
  Lines        1727     1730       +3     
==========================================
+ Hits         1623     1626       +3     
  Misses        104      104              

Flag	Coverage Δ
unittests	93.98% <100.00%> (+0.01%)	⬆️

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Impacted Files	Coverage Δ
agnpy/utils/geometry.py	100.00% <100.00%> (ø)

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