Dragon Warrior: Dragon Warrior Photosensitivity Patch

This is a simple patch for Dragon Warrior that reduces some of the flashing effects found in the game. The hack aims to help those sensitive to flashing effects experience the game.
There are two flashing effects that have been removed by this patch.
* The enemy sprites no longer flash when the player causes damage to the enemy.
* The full screen no longer flashes red from stepping on a poison swamp tile in the overworld.
* The flashing black and white screen when casting spells.

Database match: Dragon Warrior (USA) (Rev 1)
Database: No-Intro: Nintendo Entertainment System (v. 20210216-231042)
File SHA-1: 1ECC63AAAC50A9612EAA8B69143858C3E48DD0AE
File CRC32: D4D5F5D7
ROM SHA-1: 240E445AB95C3A5AFBEF63E9239EACC9F9FE1E19
ROM CRC32: 2545214C