Fixed Bard's Musical Strike AfterCastDelay (#4904)

* Fixes #4903.
* Fixes Bard's Musical Stroke AfterCastDelay from 3.0 seconds to 0.3 seconds.
Thanks to @yashimwong!

db/re/skill_db.yml

@@ -8756,7 +8756,7 @@ Body:
     HitCount: 2
     Element: Weapon
     CastTime: 500
-    AfterCastActDelay: 3000
+    AfterCastActDelay: 300
     FixedCastTime: 300
     Requires:
       SpCost: 12