NR deaths: use one event for both lich brothers

They text is the same, whoever of them dies

[ci skip]

(cherry-picked from commit 2e7d901)

data/campaigns/Northern_Rebirth/utils/herodeaths.cfg

@@ -720,13 +720,13 @@
     [event]
         name=last breath
         [filter]
-            id="Ro'Sothian"
+            id="Ro'Sothian,Ro'Arthian"
         [/filter]
 
         {INCIDENTAL_MUSIC sad.ogg}
 
         [message]
-            speaker="Ro'Sothian"
+            speaker=unit
             # wmllint: local spelling outta
             message= _ "I have had enough! Come on brother, let’s get outta here."
         [/message]
@@ -737,39 +737,7 @@
     [event]
         name=die
         [filter]
-            id="Ro'Sothian"
-        [/filter]
-
-        [message]
-            speaker=Tallin
-            message= _ "Dang it! They’re gone, and the creatures they control are leaving too. Without them, this is hopeless."
-        [/message]
-
-        [endlevel]
-            result=defeat
-        [/endlevel]
-    [/event]
-
-    [event]
-        name=last breath
-        [filter]
-            id="Ro'Arthian"
-        [/filter]
-
-        {INCIDENTAL_MUSIC sad.ogg}
-
-        [message]
-            speaker="Ro'Arthian"
-            message= _ "I have had enough! Come on brother, let’s get outta here."
-        [/message]
-
-        {FLASH_WHITE ()}
-    [/event]
-
-    [event]
-        name=die
-        [filter]
-            id="Ro'Arthian"
+            id="Ro'Sothian,Ro'Arthian"
         [/filter]
 
         [message]