Simplify RemoteInputConnectionImpl#finishComposingText*() am: a9156d61fb

Original change: https://android-review.googlesource.com/c/platform/frameworks/base/+/2911242

Change-Id: Ib8e9d609f5bb53165d765ccafd4713aa37a8fd79
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>