Interpreter: don't PanicAlert on write to SPR_HID2.

The alert apparently triggers on Midway Arcade Treasures 2; given that the
game otherwise works fine, it's not a high priority to accurately emulate
the bit in question.

Fixes issue 7197.
Merge pull request #288 from magumagu/remove-hid2-panicalert

Interpreter: don't PanicAlert on write to SPR_HID2.