SGB: in-game hook reset can cause save corruption

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Using the in-game hook reset in the Pokemon Gold start menu where it shows the current time can occasionally cause save corruption. When the corruption happens the game freezes without a successful reset. Resetting a second time is successful, but the save data is corrupted and saves are gone on next boot. It's not clear what causes this. Possibly related to:

• using in-game reset
• save states using overlapping X+R button combination
• SGB to SNES transfers going on in the background

It's difficult to hit as most times the reset works. Creating an issue to document since it's a particularly bad bug. I'll have to figure out the cause and fix it.