Global getWeb3Provider fixed

[Viterbo]

Fixes #772

Description

This PR fixes the bug described in the issue #772. The problem was that the global getWeb3Provider was returning the current authenticator's provider as the first option not taking into account that you may be using Metamask but at this moment it is pointing to another blockchain. So it does not work.

Now the only possible answer is a JsonRpcProvider which works pretty well for reading the blockchain contracts.

Test scenarios

• Login into your Metamask and change the network to Ethereum

• Then visit this link. You will get a "not found" sign:
  https://wallet.telos.net/evm/collectible-details?contract=0x63F8948c2Ee0670758A4E60EED80aAa6Cf093356&id=1141&tab=attributes

• Try then this link and you should see the NFT with no problems:
  https://deploy-preview-775--wallet-develop-mainnet.netlify.app/evm/collectible-details?contract=0x63F8948c2Ee0670758A4E60EED80aAa6Cf093356&id=1141&tab=attributes

Checklist:

• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have cleaned up the code in the areas my change touches
• My changes generate no new warnings
• Any dependent changes have been merged and published in downstream modules
• I have checked my code and corrected any misspellings
• I have removed any unnecessary console messages
• I have included all english text to the translation file and/or created a new issue with the required translations for the currently supported languages
• I have tested for mobile functionality and responsiveness
• I have added appropriate test coverage

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[ezra-sg]

hmm i am now getting a ton of this one CORS error

i think it is related to the change because the jsonRpcProvider is using that URL which is throwing an error, right?

[Viterbo]

Thanks @ezra-sg, that was EPIC!!

[ezra-sg]

nice! seems to work well for me. i found an issue but it is also present on master, so not due to this PR. I created this: #779