set networkID to testnet-2

[0xKtota]

Description

• testnet-1 is outdated.
• testnet-2 is the current network as seen in the node-docker-setup: https://github.com/iotaledger/node-docker-setup/blob/5e280df2cca8fd2a1ddda28f90cefeea2b4a562c/testnet/config.json

Type of change

Please delete options that are not relevant.

• [x] Enhancement (non-breaking change which adds functionality)

How Has This Been Tested?

Changed in the config.json file. -> "targetNetworkName": "testnet-2",

Checklist:

• [x] My code follows the style guidelines of this project
• [x] I have commented my code, particularly in hard-to-understand areas
• [x] I have made corresponding changes to the documentation
• [x] I have tested my code extensively
• [x] I have selected the develop branch as the target branch