simplify switch statement in the transport parameter parser

[marten-seemann]

No description provided.

[codecov]

Codecov Report

Merging #2995 (8e94f08) into master (d1c5297) will decrease coverage by 0.01%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #2995      +/-   ##
==========================================
- Coverage   86.12%   86.11%   -0.01%     
==========================================
  Files         135      135              
  Lines        9379     9373       -6     
==========================================
- Hits         8077     8071       -6     
  Misses        943      943              
  Partials      359      359              

Impacted Files	Coverage Δ
internal/wire/transport_parameters.go	88.33% <100.00%> (-0.28%)	⬇️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update d1c5297...8e94f08. Read the comment docs.