[flexiglass] Fetch InputMethod subtypes using the explicit user ID.

IME subtypes were being fetched without passing in a user ID, which
fetches them for the currently-selected user by default.

Fix: 354968281
Flag: com.android.systemui.scene_container
Test: Updated unit tests, and existing ones still pass.
Change-Id: I6d2ee05d6c816ecf23e8ec313a2a53e64d8db06f
7 files changed