fix: display the correct amount of remaining time for fast-tracked PRs

[aduh95]

Refs: nodejs/node-auto-test#40 (comment)

[codecov]

Codecov Report

Merging #581 (57abe86) into main (7d9e7f0) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main     #581   +/-   ##
=======================================
  Coverage   82.57%   82.57%           
=======================================
  Files          35       35           
  Lines        1750     1750           
=======================================
  Hits         1445     1445           
  Misses        305      305           

Impacted Files	Coverage Δ
lib/pr_checker.js	97.22% <100.00%> (ø)

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