Specify the display ID to mirror when creating virtual display

In VirtualDisplayConfig, the default value of mDisplayIdToMirror is
DEFAULT_DISPLAY. In order to create virtual display for visible
background users (running on secondary displays), this CL passed the
correct display ID when creating virtual display.

Bug: 355529421
Test: atest CtsWindowManagerDeviceIme
Test: atest --user-type secondary_user CtsWindowManagerDeviceIme
Test: atest --user-type secondary_user_on_secondary_display CtsWindowManagerDeviceIme
Flag: EXEMPT bugfix
(cherry picked from https://googleplex-android-review.googlesource.com/q/commit:036933d9608c43e483514e1c1003aaa6531664f1)
Merged-In: Ibdd39e598560c08bcaf6fa2846191b82bae1a8ab
Change-Id: Ibdd39e598560c08bcaf6fa2846191b82bae1a8ab