fix(web-reporter): fix running web-reporter with absolute path

[Almouro]

Using process.cwd() was unnecessary, plus it was breaking absolute paths

For instance when running npx @perf-profiler/web-reporter /tmp/my-folder, the script would try to open /Users/almouro/dev/projects/my-project//tmp/my-folder instead of tmp/my-folder directly

[flashlight-bot]

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