Fix color-spantrace test due to misinterpreted relative paths #266

Job	Run time
Check (stable)	22s
Test Suite (stable)	1m 22s
Clippy (stable)	42s
Test Suite (stable, --no-default-features)	53s
Rustfmt (stable)	15s
Miri	1m 28s
Test Suite (ubuntu-latest)	1m 6s
Test Suite	4m 33s
Test Suite (stable, --features track-caller)	57s
Test Suite (windows-latest)	2m 0s
Test Suite (--no-default-features)	5m 49s
Test Suite (macOS-latest)	1m 35s
Test Suite (stable, --features pyo3)	1m 1s
Test Suite (--features track-caller)	5m 44s
Test Suite (stable, --features auto-install)	1m 3s
Test Suite (--features auto-install)	4m 35s
Test Suite (stable, --all-features)	57s
Test Suite (beta)	57s
Test Suite (beta, --no-default-features)	1m 5s
Test Suite (beta, --features track-caller)	53s
Test Suite (beta, --features pyo3)	55s
Test Suite (beta, --features auto-install)	1m 9s
Test Suite (beta, --all-features)	54s
Test Suite (nightly)	1m 12s
Test Suite (nightly, --no-default-features)	1m 12s
Test Suite (nightly, --features track-caller)	1m 10s
Test Suite (nightly, --features pyo3)	1m 35s
Test Suite (nightly, --features auto-install)	1m 7s
Test Suite (nightly, --all-features)	1m 14s
	47m 45s

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