fix(transport/http): no need to call EncodeURL twice in test

[kvii]

Description (what this PR does / why we need it):

A small improve for test code.

Which issue(s) this PR fixes (resolves / be part of):

Other special notes for the reviewers:

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 84.72%. Comparing base (9106991) to head (f05bef4).

❗ Current head f05bef4 differs from pull request most recent head f3fab6c. Consider uploading reports for the commit f3fab6c to get more accurate results

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Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3218      +/-   ##
==========================================
+ Coverage   84.62%   84.72%   +0.10%     
==========================================
  Files          88       88              
  Lines        3993     3993              
==========================================
+ Hits         3379     3383       +4     
+ Misses        440      438       -2     
+ Partials      174      172       -2     

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