"attached_pumpkin_stem" and "melon_stem" textures were never changed

The Bug

The "attached_pumpkin_stem" and "melon_stem" textures resemble their pre-texture-update counterparts. This is likely because JAPPA forgot that there were individual textures for both pumpkin and melon stems.

Observed Result

The textures for the attached pumpkin stem and melon stem were the same as the pre-1.14 textures

Expected Result

The textures for the attached pumpkin stem and melon stem would be updated