Do not show install shortcut for Settings

Private profile shares Settings with the main user,
this change disable showing "Install to private"
long-press shortcut for Settings.

Bug: 316118005
Test: long press on Settings app
Flag: ACONFIG com.android.launcher3.Flags.enable_private_space_install_shortcut DEVELOPMENT

Change-Id: Iecc0bdf60879ce5c74288942d39bbb3add68fd9c