TSG S3: change side switch procedure for Ethiliel

Ethiliel remains on side 3, but a copy of her is added to the player's recall
list for next scenario. The loyal trait is obtained at that point.

[ci skip]

data/campaigns/The_South_Guard/scenarios/03_A_Desparate_Errand.cfg

@@ -378,8 +378,9 @@
             side=3
             x,y=18,6
             facing=sw
+            random_traits=no
             [modifications]
-                {TRAIT_LOYAL}
+                # Loyal trait is given later
                 {TRAIT_QUICK}
             [/modifications]
         [/unit]
@@ -436,12 +437,40 @@
             message= _ "My thanks, lady."
         [/message]
 
-        {MODIFY_UNIT (id=Ethiliel) side 1}
-
         [endlevel]
             result=victory
             bonus=yes
             {NEW_GOLD_CARRYOVER 40}
         [/endlevel]
     [/event]
+
+    [event]
+        name=victory
+
+        [store_unit]
+            [filter]
+                id=Ethiliel
+            [/filter]
+            variable=EthilielV
+            kill=no # Current Ethiliel may remain on the field for visual reasons.
+        [/store_unit]
+        # Stores a copy of Ethiel onto the recall list. The recall list cannot be
+        # viewed in linger mode. Give here as well the loyal trait.
+        {VARIABLE EthilielV.side 1}
+        {VARIABLE EthilielV.x recall}
+        {VARIABLE EthilielV.y recall}
+        {CLEAR_VARIABLE EthilielV.modifications}
+        [set_variables]
+            name=EthilielV.modifications
+            mode=insert
+            [value]
+                {TRAIT_LOYAL}
+                {TRAIT_QUICK}
+            [/value]
+        [/set_variables]
+        [unstore_unit]
+            variable=EthilielV
+        [/unstore_unit]
+        {CLEAR_VARIABLE EthilielV}
+    [/event]
 [/scenario]