Don't apply ime adjustments/dims if split is not active

Bug: 151053107
Test: Open IME on lockscreen (password) and see that there is
      no dim.
Change-Id: I9aff9ee4b3efc6feba8e8dfd74af9209dd55b05d
(cherry picked from commit e5fb45a7084384e8ae20dc313c2366f60e033a37)
2 files changed