Remove duplicate log in DisplayContent

This CL addresses the comment from the original logging CL [1].
Removing the duplicate log.

[1] Iad0a21d81a22d6acfaaf5c5ca8b5131eec411e79

Bug: 154348613
Test: manually build and flash.
      Verify showing and hiding IME shows logs.
      verify adb shell dumpsys window windows has new dumps
Change-Id: I982302e5aa2cb484b5c62dd904efa9d22296fb1d