Versioning not working for token_supplies

[fschoell]

See issue here:

antelope-token-api/schema.sql

Line 209 in 75db1c6

(block_num + action_index) AS ver

This means the version of block 1 could be higher than a version of block 2, if the action_index of the supply change is higher in block 1.

To avoid this we should use something like (block_num * 1000 + action_index) instead