Removed unused duration/upkeep values for `AM_TWILIGHT` skills.

git-svn-id: https://svn.code.sf.net/p/rathena/svn/trunk@14108 54d463be-8e91-2dee-dedb-b68131a5f0ec

db/skill_cast_db.txt

@@ -840,11 +840,11 @@
 //-- KN_ONEHAND
 495,0,0,0,300000,0
 //-- AM_TWILIGHT1
-496,3000,10000,0,50,0
+496,3000,10000,0,0,0
 //-- AM_TWILIGHT2
-497,3000,10000,0,50,0
+497,3000,10000,0,0,0
 //-- AM_TWILIGHT3
-498,3000,10000,0,50,0
+498,3000,10000,0,0,0
 //-- HT_POWER
 499,0,0,0,100,0
 //==========================================