Clear calling id in dontOverrideDisplayInfo.

It might create DisplayContent in some cases where WM may need to do
something only privileged processes are allowed to do.

Bug: 111840884
Test: dontOverrideDisplayInfo succeeds with the freeform windowing mode
CL.

Change-Id: I09b32c8fa2be4bd775a11e884c81cc38cb2c2368