fix(share/p2p/shrexeds): return correct err on context error

[derrandz]

Overview

Resolves item 7 on #2176

Checklist

• New and updated code has appropriate documentation
• New and updated code has new and/or updated testing
• Required CI checks are passing
• Visual proof for any user facing features like CLI or documentation updates
• Linked issues closed with keywords

[codecov-commenter]

Codecov Report

Merging #2177 (0371e52) into main (7f556f0) will decrease coverage by 0.15%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##             main    #2177      +/-   ##
==========================================
- Coverage   56.04%   55.89%   -0.15%     
==========================================
  Files         215      215              
  Lines       13918    13918              
==========================================
- Hits         7800     7780      -20     
- Misses       5340     5359      +19     
- Partials      778      779       +1     

Impacted Files	Coverage Δ
share/p2p/shrexeds/client.go	64.00% <0.00%> (ø)

... and 4 files with indirect coverage changes

[Wondertan]

It's a fix not a chore though