DiD S7: flipped filter for undead sighted event

Previously, we were saying, 'when side 1 sees side 2', when it should be the opposite

data/campaigns/Descent_Into_Darkness/scenarios/07_A_Small_Favor.cfg

@@ -322,15 +322,15 @@
     [event]
         name=sighted
         [filter]
-            side=2
+            side=1
         [/filter]
         [filter_second]
-            side=1
+            side=2
         [/filter_second]
 
         # Sound a warning and give gold to the general
         [message]
-            speaker=unit
+            speaker=second_unit
             message= _ "Sir! Undead creatures are coming out of the forest! Wake the guard immediately!"
         [/message]