Makes computer main UI close properly, on shutdown (#7815)

what says

code/modules/modular_computers/computers/modular_computer/core.dm

@@ -169,7 +169,7 @@
 		idle_threads.Remove(P)
 	if(loud)
 		visible_message("\The [src] shuts down.")
-	SSvueui.close_uis(active_program)
+	SSvueui.close_uis(src)
 	enabled = 0
 	update_icon()
 

html/changelogs/example copy.yml

@@ -0,0 +1,4 @@
+author: Karolis2011
+delete-after: True
+changes: 
+  - bugfix: "Fixes computers so there main UI closes on shutdown."