Don't return /data/data from BuildDataUserCePath() am: aafc1bfb73

Original change: https://android-review.googlesource.com/c/platform/system/vold/+/2095483

Change-Id: Ib1953e89a41e68f845e33878b0cb7728b06a9e8e
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>