Don't require resizable check for experimental bubbles

Test: manual - 1) adb shell settings put secure allow_any_notif_to_bubble 1
               2) get an notification for an activity that isn't resizable
               3) longpress on the notif, note the bubble menu is there
               4) select bubble
               => the notification becomes a bubble
Bug: 143173197

Change-Id: Ie0b91971a969203000d9cfa19b50e44fd4c9c490