Vial unlock combo uses non-existent keys on Corne v4 Mini (3x5)

[dirandau]

Description
The Corne v4 Mini (3x5 layout) physically removes the outer columns.
However, the current config.h sets VIAL_UNLOCK_COMBO to {0, 0} and {0, 1}.
Because {0, 0} does not exist on the Mini version (only {0, 1} is available), I cannot trigger the unlock combo.

Proposed Solution
I have fixed the coordinates to point to valid keys (Row 0, Cols 1 & 2) in config.h.