Adds new ambience sounds. (#9672)

code/modules/shareddream/area.dm

@@ -1,4 +1,5 @@
 /area/centcom/shared_dream
 	name = "\improper The Shared Dream"
 	icon_state = "dream"
-	dynamic_lighting = 1
+	ambience = AMBIENCE_OTHERWORLDLY
+	dynamic_lighting = 1

code/modules/turbolift/turbolift_areas.dm

@@ -5,6 +5,7 @@
 	requires_power = 0
 	station_area = 1
 	sound_env = SMALL_ENCLOSED
+	ambience = AMBIENCE_ELEVATOR
 
 	var/lift_floor_label = null
 	var/lift_floor_name = null