[BUG] admin account has to be imported and not generated

[bertux]

Description:
admin account is generated so it can't mint the fungible token.

Steps to reproduce:

1. search for admin in https://docs.cedra.network/guides/first-fa#4-typescript-client--testing-flow

Expected behavior:
admin account should be imported from the private key used to deploy the fungible token.

Actual behavior:
admin account is generated so it can't mint the fungible token.

Possible fix:
Use the source code in fa-example which works already.