fix prox computation of IndBallL0BInf

[dpo]

No description provided.

[codecov-commenter]

Codecov Report

Merging #24 (bf1df94) into master (accea56) will increase coverage by 0.29%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master      #24      +/-   ##
==========================================
+ Coverage   37.79%   38.09%   +0.29%     
==========================================
  Files           8        8              
  Lines         127      126       -1     
==========================================
  Hits           48       48              
+ Misses         79       78       -1     

Impacted Files	Coverage Δ
src/shiftedIndBallL0BInf.jl	37.50% <0.00%> (+2.20%)	⬆️

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