Update `testSuccessfulRetry` and code to make it pass.

[danielt1263]

Update based on observation by @Kn1kt in issue #148

[codecov[bot]]

Codecov Report

Merging #150 (b8ec4a3) into main (d7b896f) will increase coverage by 0.02%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #150      +/-   ##
==========================================
+ Coverage   95.47%   95.49%   +0.02%     
==========================================
  Files          72       72              
  Lines        4284     4287       +3     
==========================================
+ Hits         4090     4094       +4     
+ Misses        194      193       -1     

Impacted Files	Coverage Δ
Sources/Operators/RetryWhen.swift	89.74% <100.00%> (-0.26%)	:arrow_down:
Tests/RetryWhenTests.swift	94.66% <100.00%> (+1.70%)	:arrow_up:

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[robnadin]

What's the status of this and #151? Any reason they are not merged?

[WoodyHang]

Again, why not merge, I need to use this operator now @danielt1263

[danielt1263]

Again, why not merge, I need to use this operator now @danielt1263

I don't think I have control over when this gets merged. Maybe @freak4pc could chime in here?