UtBS: Re-added compatibility code to load old saves using the new elves

data/campaigns/Under_the_Burning_Suns/_main.cfg

@@ -148,6 +148,51 @@
     [/about]
 [/campaign]
 
+
+
+# Compatibility code for saves using the new elves from 1.13.13 or earlier
+
+#textdomain wesnoth
+[+language]
+    EASY_NEW= _ "Easy"
+    NORMAL_NEW= _ "Medium"
+    HARD_NEW= _ "Hard"
+[/language]
+#textdomain wesnoth-utbs
+
+#ifdef CAMPAIGN_UNDER_THE_BURNING_SUNS
+
+#ifdef EASY_NEW
+#define EASY
+#enddef
+#define UTBSNEW
+#enddef
+#endif
+
+#ifdef NORMAL_NEW
+#define NORMAL
+#enddef
+#define UTBSNEW
+#enddef
+#endif
+
+#ifdef HARD_NEW
+#define HARD
+#enddef
+#define UTBSNEW
+#enddef
+#endif
+
+#ifdef UTBSNEW
+# Need to re-load this for ON_DIFFICULTY to not break due to a missing
+# EASY/NORMAL/HARD symbol
+{core/macros/utils.cfg}
+#endif
+
+#endif
+
+
+
 #ifdef CAMPAIGN_UNDER_THE_BURNING_SUNS
 
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