Merge branch 'dont-load-dont-unload' into 'next'

Fix a dedicated crash in Special Stage intermissions (2.2.9 RC1)

See merge request STJr/SRB2!1475

src/y_inter.c

@@ -2069,7 +2069,8 @@ static void Y_AwardSpecialStageBonus(void)
 //
 void Y_EndIntermission(void)
 {
-	Y_UnloadData();
+	if (!dedicated)
+		Y_UnloadData();
 
 	endtic = -1;
 	intertype = int_none;