Fix paths when running clang-tidy on git diffs (#161496) The working directory was `engine/src/flutter` but all of the file names already had those parent directories on them so we'd be trying to find build commands for `engine/src/flutter/engine/src/flutter`. This change tells the git commands to make the file names relative to the working directory (which is already `engine/src/flutter`). Someone more familiar with the `--lint-head` option should double check its operation since I wasn't sure exactly what it was supposed to do, but the list of files it generated looked correct.
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