Metroid II: Return of Samus: Consistently Consistent Cannon

When starting a game on Metroid 2, Samus' arm cannon is just there, on her arm, minding its own business.
...Until she switches to missiles. Once she switches back, the peculiar pattern of pixels on display is not the same gun she started with.
It's a very minor cosmetic issue, but it's just as easy to get these things right, you know.

This patch serves up a simple, singular sprite swap to give some semblance of satisfaction in seeing Samus' suit stay the same.

Database match: Metroid II - Return of Samus (World)
Database: No-Intro: Game Boy/Color (v. 20180815-131105)
File/ROM SHA-1: 74A2FAD86B9A4C013149B1E214BC4600EFB1066D
File/ROM CRC32: DEE05370