Fix missing showWhenLocked activity attribute

This is a follow up of I28076aad00.  Moving tests to other package
accidentally missed an important Activity attribute.

Bug: 113800711
Fixes: 119037340
Test: atest WmTests:com.android.server.wm.ScreenDecorWindowTests on
  sleeping device.
Change-Id: I8fc2683ad65e627c4e002b767fd23a4dd9f16223
1 file changed