impr(CLDSRV-869): Fix buckets refilled calculation

[tmacro]

Previously a bucket would be counted as "refilled" every time after the first refill.

[codecov]

Codecov Report

❌ Patch coverage is 62.50000% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 84.30%. Comparing base (39751a9) to head (a842dd2).
⚠️ Report is 2 commits behind head on improvement/CLDSRV-869/account_limiting.
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
lib/api/apiUtils/rateLimit/tokenBucket.js	50.00%	3 Missing ⚠️

Additional details and impacted files

Files with missing lines	Coverage Δ
lib/api/apiUtils/rateLimit/refillJob.js	89.47% <100.00%> (ø)
lib/api/apiUtils/rateLimit/tokenBucket.js	82.89% <50.00%> (-1.11%)	⬇️

... and 2 files with indirect coverage changes

@@                             Coverage Diff                             @@
##           improvement/CLDSRV-869/account_limiting    #6162      +/-   ##
===========================================================================
+ Coverage                                    84.22%   84.30%   +0.07%     
===========================================================================
  Files                                          204      204              
  Lines                                        13107    13108       +1     
===========================================================================
+ Hits                                         11040    11051      +11     
+ Misses                                        2067     2057      -10     

Flag	Coverage Δ
file-ft-tests	68.04% <37.50%> (+0.04%)	⬆️
kmip-ft-tests	28.47% <0.00%> (-0.01%)	⬇️
mongo-v0-ft-tests	69.23% <37.50%> (+<0.01%)	⬆️
mongo-v1-ft-tests	69.22% <37.50%> (-0.04%)	⬇️
multiple-backend	35.60% <0.00%> (-0.01%)	⬇️
sur-tests	36.13% <0.00%> (+0.02%)	⬆️
sur-tests-inflights	37.99% <0.00%> (-0.01%)	⬇️
unit	69.65% <62.50%> (-0.01%)	⬇️
utapi-v2-tests	34.81% <0.00%> (-0.01%)	⬇️

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