SF: return the active display from getInternalDisplayId

So clients that uses SurfaceComposerClient::getInternalDisplayId
such as screenrecord would get the current active display

Test: screenrecord
Bug: 193821864
Bug: 199336728
Change-Id: Ief856c736c78ab9ddca3c4ffccd8e374c050b0bd
Merged-In: Ief856c736c78ab9ddca3c4ffccd8e374c050b0bd
1 file changed