scheduler: fix reservation calc error

[eahydra]

Ⅰ. Describe what this PR does

Ⅱ. Does this pull request fix one issue?

Ⅲ. Describe how to verify it

Ⅳ. Special notes for reviews

V. Checklist

• I have written necessary docs and comments
• I have added necessary unit tests and integration tests
• All checks passed in make test

[buptcozy]

/lgtm

[buptcozy]

/approve

[koordinator-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: buptcozy

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 67.50%. Comparing base (61c0013) to head (f8c26c8).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1949      +/-   ##
==========================================
- Coverage   67.51%   67.50%   -0.01%     
==========================================
  Files         420      420              
  Lines       46966    46968       +2     
==========================================
- Hits        31709    31706       -3     
- Misses      12947    12951       +4     
- Partials     2310     2311       +1     

Flag	Coverage Δ
unittests	67.50% <100.00%> (-0.01%)	⬇️

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