Fix ttFactor in QuoterCenter

[bigsheeper]

Signed-off-by: bigsheeper yihao.dai@zilliz.com

issues: #19750

[codecov]

Codecov Report

Merging #19802 (38cb912) into master (89c9cb3) will decrease coverage by 0.01%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master   #19802      +/-   ##
==========================================
- Coverage   81.18%   81.16%   -0.02%     
==========================================
  Files         664      664              
  Lines       90501    90501              
==========================================
- Hits        73471    73459      -12     
- Misses      13987    13997      +10     
- Partials     3043     3045       +2     

Impacted Files	Coverage Δ
internal/rootcoord/quota_center.go	75.25% <0.00%> (ø)
internal/indexnode/taskinfo_ops.go	82.08% <0.00%> (-8.96%)	⬇️
internal/indexnode/task_scheduler.go	86.30% <0.00%> (-2.74%)	⬇️
internal/datanode/flow_graph_dd_node.go	88.97% <0.00%> (-2.45%)	⬇️
internal/querycoordv2/task/executor.go	73.25% <0.00%> (-2.44%)	⬇️
internal/datacoord/segment_manager.go	86.70% <0.00%> (-2.03%)	⬇️
internal/indexcoord/garbage_collector.go	91.84% <0.00%> (-1.09%)	⬇️
internal/indexcoord/index_builder.go	98.96% <0.00%> (-0.78%)	⬇️
internal/datacoord/meta.go	87.15% <0.00%> (-0.64%)	⬇️
internal/indexnode/task.go	50.40% <0.00%> (-0.55%)	⬇️
... and 9 more

[czs007]

/approve
/lgtm

[sre-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

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