Fix shared variable latex

[ricardoV94]

Closes #6253
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Major / Breaking Changes

• ...

Bugfixes / New features

• Fix error in string and latex representation of shared inputs

Docs / Maintenance

• ...

[codecov]

Codecov Report

Merging #6260 (4262bdc) into main (b0d1066) will increase coverage by 25.55%.
The diff coverage is 100.00%.

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #6260       +/-   ##
===========================================
+ Coverage   64.39%   89.95%   +25.55%     
===========================================
  Files         101      102        +1     
  Lines       21465    21478       +13     
===========================================
+ Hits        13823    19321     +5498     
+ Misses       7642     2157     -5485     

Impacted Files	Coverage Δ
pymc/printing.py	87.90% <100.00%> (+63.53%)	⬆️
pymc/tests/stats/test_convergence.py	100.00% <0.00%> (ø)
pymc/model.py	89.47% <0.00%> (+0.27%)	⬆️
pymc/step_methods/metropolis.py	83.47% <0.00%> (+0.41%)	⬆️
pymc/math.py	70.04% <0.00%> (+0.48%)	⬆️
pymc/distributions/distribution.py	95.00% <0.00%> (+2.27%)	⬆️
pymc/aesaraf.py	94.04% <0.00%> (+2.33%)	⬆️
pymc/tests/distributions/util.py	90.86% <0.00%> (+2.46%)	⬆️
pymc/backends/arviz.py	90.08% <0.00%> (+4.54%)	⬆️
pymc/distributions/logprob.py	91.09% <0.00%> (+4.79%)	⬆️
... and 51 more

[ricardoV94]

Failing test seems unrelated

[aloctavodia]

LGTM!