Remove dock requirement to transition to hub when exiting dream

The desired behavior is that we transition to the hub even when
undocked, if the dream is set to "while charging"

Bug: 325102385
Test: flashed device and verified we correctly transition when off the
dock
Flag: ACONFIG com.android.systemui.communal_hub TEAMFOOD

Change-Id: I346dc870c4ae6bab3e878e7a73ce6ace85ad311c