Z80-Retro/2063-Z80

Disconnect U3.1 and U3.30

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U3.1 and U3.30 are NC pins on the SST39SF010. On the larger versions of that FLASH family, they would need to be pulled low. On UV EPROMs they might need other settings. By disconnecting them it will be easier to mod the board to suit any such need without changing anything when using a SST39SF010.

This change has been made in Rev4.