Bugfix: Wallet redirecting to TelosZero mainnet even when testnet is selected

[Viterbo]

Fixes #823

Description

In this PR a refactor was made so that the native part stops depending on the environment variables and becomes completely dependent on the selected blockchain

Test scenarios

• go to this link
• Select Telos Zero
• Login with any option
  • you should remain on the Native Mainnet
  • Test as many functionalities as you can (transfer, stake, etc)
  • All functionalities should work properly
  • Log out
• Select Telos Zero (Testnet)
  • you should remain on the native testnet
  • repeat all what you did for the previous case
  • All functionalities should work properly also

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