Ensure that shortcut customization dialog opens on same display as

shortcut helper

Fix: 443698616
Flag: com.android.systemui.shortcut_helper_multi_display_support
Test: Manual - ensure that when shortcut helper shows on an external
display, the shortcut customization dialog also shows on that display

Change-Id: If19d081723364d0c43eceb6e26d53c9ef24f0aab