ALICE3-TRK: adapt ordering key for digits to the large number of columns in the VD

[atriolo]

In the VD case, the sensor covers the full z acceptance of the layer, from z=-25 to z=25 cm, for a total of 50000 columns for a single sensor.
When the number of columns exceeded 32768 = 2^15, the function getOrderingKey(...), which uniquely assigns an ID to each digit, was not working properly anymore.

Issue explained here.

The issue is solved with this commit by casting the column variable to 64-bit before the bit-to-bit shift operated in the function.
This modification is applied only to the TRK class.

[github-actions]

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