check_aosp_license: Fix argument parser am: 2f34130ddf

Original change: https://android-review.googlesource.com/c/platform/tools/repohooks/+/3427922

Change-Id: I00e161273201bb90743b8cfa9f02678b7b71c762
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>