Enable using prediction manager for sharesheet.

Sharesheet in AiAi is currently disabled, so sharesheet will
default to ranker. This will allow remote enabling for experimentation.

Bug:129014961
Test:Manually tested.
Test: atest frameworks/base/core/tests/coretests/src/com/android/internal/app
Change-Id: I0c21c29356120a873940bcaa8a659ea02046be71