sbox: fix typo when comparing files am: fa8e9cc3a1

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

Change-Id: I1487c414e1b2b15cd6ecee37937392f4457c0098
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>