[automerge] Rename Encoder test names. 2p: 0c1f32bfa2 2p: 9df600ed6f

Original change: https://googleplex-android-review.googlesource.com/c/platform/external/libtextclassifier/+/17392093

Bug: 226182044
Change-Id: Id6817586cefee4bd19a794671f1970fa31ebaf78