[pyflakes] Fix allowed-unused-imports matching for top-level modules (F401)#20115

ntBre merged 3 commits intoastral-sh:mainastral-sh/ruff:mainfrom

TaKO8Ki:allowed-unused-imports-top-level-moduleTaKO8Ki/ruff:allowed-unused-imports-top-level-moduleCopy head branch name to clipboard