HttT S16: Hide Li'sar on prestart, not start

Otherwise she is visible for a split second at the start of the
scenario.

data/campaigns/Heir_To_The_Throne/scenarios/16_Hasty_Alliance.cfg

@@ -42,6 +42,12 @@
                 carryover_percentage=40
             [/gold_carryover]
         [/objectives]
+
+        #hide Li'sar until she arrives
+        [hide_unit]
+            x=12
+            y=18
+        [/hide_unit]
     [/event]
 
     [story]
@@ -132,12 +138,6 @@
 
         # {SCATTER_IMAGE (terrain=Uu) 4 scenery/rubble.png}
 
-        #hide Li'sar until she arrives
-        [hide_unit]
-            x=12
-            y=18
-        [/hide_unit]
-
         [recall]
             id=Delfador
         [/recall]