welp i got lazy

code/modules/client/preferences.dm

@@ -21,7 +21,7 @@ GLOBAL_LIST_EMPTY(preferences_datums)
 	var/last_ip
 	var/last_id
 
-	var/mutable_appearance/custom_holoform
+	var/icon/custom_holoform_icon
 	var/last_custom_holoform = 0
 
 	//Cooldowns for saving/loading. These are four are all separate due to loading code calling these one after another

code/modules/client/verbs/custom_holoform.dm

@@ -11,8 +11,8 @@
 
 	if(prefs.last_custom_holoform < world.time + CUSTOM_HOLOFORM_DELAY)
 		to_chat(src, "<span class='warning'>You are attempting to change custom holoforms too fast!</span>")
-	var/mutable_appearance/new_holoform = user_interface_custom_holoform(src)
+	var/icon/new_holoform = user_interface_custom_holoform(src)
 	if(new_holoform)
-		prefs.custom_holoform = new_holoform
+		prefs.custom_holoform_icon = new_holoform
 		prefs.last_custom_holoform = world.time
 		to_chat(src, "<span class='boldnotice'>Holoform set.</span>")