bookcases no longer opaque

considering they are mostly empty they shouldn't be totally opaque, it's awkward in game

code/modules/library/lib_items.dm

@@ -16,7 +16,7 @@
 	icon_state = "bookempty"
 	anchored = 0
 	density = 1
-	opacity = 1
+	opacity = 0
 	var/state = 0
 
 
@@ -314,4 +314,4 @@
 		user << "<font color=green>Computer has been associated with this unit.</font>"
 	else
 		user << "<font color=red>No associated computer found. Only local scans will function properly.</font>"
-	user << "\n"
+	user << "\n"