[Tales of Phantasia] text box scrolling bug

[ITotalJustice]

the text box scrolls with the background.
https://user-images.githubusercontent.com/47043333/163222649-f16f9bb2-798a-4b7b-ba46-598c8344d380.mp4

the game actually does a dma (hdma?) every scanline which writes to bg1 scroll regs. this was broken due to https://github.com/ITotalJustice/notorious_beeg/blob/master/src/core/dma.cpp#L328