plural typo fix for test of the clan

data/campaigns/Heir_To_The_Throne/scenarios/25_Test_of_the_Clans.cfg

@@ -14,7 +14,6 @@
 	{SECOND_WATCH}
 
 	next_scenario=26_battle_for_wesnoth
-	victory_when_enemies_defeated=no
 
 	[event]
 	name=prestart
@@ -170,10 +169,8 @@
 
 	[event]
 	name=prestart
-		[set_variable]
-			name=units_slain
-			value=0
-		[/set_variable]
+		{VARIABLE units_slain 0}
+		{VARIABLE s " "}
 		[recall]
 			description=Delfador
 		[/recall]
@@ -419,6 +416,7 @@
 		result=victory
 		bonus=yes
 		{CLEAR_VARIABLE units_slain}
+		{CLEAR_VARIABLE s}
 	[/endlevel]
 #enddef
 
@@ -433,7 +431,7 @@
 
 		[set_variable]
 			name=temp_string
-			format= _ "|$units_slain| Clan Members Defeated"
+			format= _ "|$units_slain| Clan Member|$s|Defeated"
 		[/set_variable]
 
 		[print]
@@ -443,6 +441,7 @@
 		[/print]
 
 		{CLEAR_VARIABLE temp_string}
+		{VARIABLE s "s "}
 
 		[if]
 			[variable]