sbox: fix typo when comparing files am: fa8e9cc3a1 am: 898ed6d7f0

Original change: https://android-review.googlesource.com/c/platform/build/soong/+/2063167

Change-Id: Ib03bc81b4748c53e9322c3cd499dc53e54049a5b
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>