EI S03: Fix the chance-to-hit on the initial Dark Adept

The map was changed to use ruined castles in 1.14.12 (fb6d79c8) and 1.15.3
(704fa2ef), but the .cfg file was missed.

changelog.md

@@ -5,6 +5,8 @@
    * Descent into Darkness:
      * S11: fix low probability case of enemy being unreachable
      * S11: recall ghosts if available and ensure the player gets one level 2 ghost.
+   * Eastern Invasion:
+     * S03: fix the initial keep being blocked at the start
  ### Translations
    * Updated translations: British English, Catalan, French, German, Italian, Japanese,
      Polish, Portuguese (Brazil), Russian

data/campaigns/Eastern_Invasion/scenarios/03_An_Unexpected_Appearance.cfg

@@ -128,7 +128,7 @@
             id=Mal-Tar
 
             [filter_location]
-                terrain=Ke
+                terrain=K*
             [/filter_location]
         [/have_unit]
     )}