Core/Unit: Set Holy Power ammount to 3. Holy Power can now be gained by using Crusader Strike.

src/server/game/Entities/Unit/Unit.cpp

@@ -12887,7 +12887,7 @@ int32 Unit::GetCreatePowers(Powers power) const
         case POWER_ECLIPSE:
             return 0;
         case POWER_HOLY_POWER:
-            return 0;
+            return 3;
         case POWER_HEALTH:
             return 0;
         default: