Optimize ut for Test_RouteRuleImplBase_finalizePathHeader

[Atticusw]

…zePathHeader

modify ut for pkg/router/base_rule_test.Test_RouteRuleImplBase_finalizePathHeader

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UT result

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Code Style

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[3062]

LGTM

[codecov]

Codecov Report

Base: 60.33% // Head: 60.31% // Decreases project coverage by -0.01% ⚠️

Coverage data is based on head (04cdb4f) compared to base (bbed393).
Patch has no changes to coverable lines.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2213      +/-   ##
==========================================
- Coverage   60.33%   60.31%   -0.02%     
==========================================
  Files         420      422       +2     
  Lines       36966    37050      +84     
==========================================
+ Hits        22302    22346      +44     
- Misses      12445    12483      +38     
- Partials     2219     2221       +2     

Impacted Files	Coverage Δ
pkg/istio/xds.go	84.61% <0.00%> (-1.99%)	⬇️
pkg/mosn/init.go	26.88% <0.00%> (-0.90%)	⬇️
pkg/upstream/healthcheck/healthchecker.go	88.65% <0.00%> (-0.32%)	⬇️
pkg/module/http2/server.go	81.70% <0.00%> (-0.15%)	⬇️
pkg/config/v2/config.go	61.11% <0.00%> (ø)
pkg/config/v2/upstream.go	69.33% <0.00%> (ø)
pkg/stagemanager/stage_manager.go	44.40% <0.00%> (ø)
pkg/upstream/healthcheck/healthchecklog.go	27.77% <0.00%> (ø)
pkg/upstream/cluster/lb_leastconnection.go	30.76% <0.00%> (ø)
pkg/module/http2/transport.go	79.05% <0.00%> (+0.14%)	⬆️
... and 8 more

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