DM S20: Improve Delfador's arrival

He now comes from the edge of the map, and there's no longer a brief
moment where he is not visible after appearing.

data/campaigns/Delfadors_Memoirs/scenarios/20_Prince_of_Wesnoth.cfg

@@ -193,12 +193,19 @@
 
         # Keep his unit on the board
         {MODIFY_UNIT id=Eldred hitpoints 1}
+        [delay]
+            time=500
+        [/delay]
+
+        # wmllint: recognize Delfador
+        {DELFADOR_ARRIVES 26 20}
+        [move_unit]
+            id=Delfador
+            to_x=26,25,25,24,24
+            to_y=19,19,18,17,16
+        [/move_unit]
+        {MODIFY_UNIT (id=Delfador) facing ne}
 
-        [move_unit_fake]
-            type=Elder Mage
-            x=25,24,24
-            y=18,17,16
-        [/move_unit_fake]
         [endlevel]
             result=victory
         [/endlevel]
@@ -207,9 +214,6 @@
     [event]
         name=victory
 
-        # wmllint: recognize Delfador
-        {DELFADOR_ARRIVES 24 16}
-
         [scroll_to_unit]
             id=Delfador
         [/scroll_to_unit]

data/campaigns/Delfadors_Memoirs/utils/sides.cfg

@@ -648,7 +648,6 @@
         placement=map
         passable=yes
         overwrite=no
-        facing=ne
         side=1
     [/unit]
     # clears any fog around his appearance