fix(coverage): normalize exclude path

[kwonoj]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 93.10345% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 45.38%. Comparing base (75c5b18) to head (9f14942).
⚠️ Report is 5 commits behind head on main.

Files with missing lines	Patch %	Lines
packages/swc-plugin-coverage/src/lib.rs	93.10%	2 Missing ⚠️

Additional details and impacted files

@@ Coverage Diff @@ ## main #275 +/- ## ========================================== + Coverage 45.01% 45.38% +0.36%  ========================================== Files 30 30 Lines 3925 3953 +28 ========================================== + Hits 1767 1794 +27  - Misses 2158 2159 +1 

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