jni: Fix improper call to createFromExisting()

 * We need to pass "false" as another parameter to fix a jboolean
   check crash on eng builds.

F system_server: runtime.cc:566] JNI DETECTED ERROR IN APPLICATION: unexpected jboolean value: 319040960
F system_server: runtime.cc:566]     in call to CallStaticObjectMethodV
F system_server: runtime.cc:566]     from android.graphics.GraphicBuffer android.view.SurfaceControl.nativeCaptureLayers(android.os.IBinder, android.graphics.Rect, float)

Change-Id: I7a88225d3ebeb5d74b209cd1f962f1da3c1e8290