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: Ifcac72f0fe5a59b4b1de2a696281ea2c76b3e9b5
(cherry picked from commit ee94e8d98904e746d9d626504b33605cc081e011)
2 files changed