fixing wrong usingQR flag

[Viterbo]

Fixes #636

Description

This PR fixes the wrong flag usingQR set internally when WalletConnectAuth tries to decide if the user is using an injected provider (Desktop) or is logged from the Mobile throw the QR. If the second is detected the internal flag usingQR is set to true and that makes the class skip checking if the local provider is connected to the correct blockchain. That check was skipped and that generated an error every time the user tried to sign a new transaction.

This error occurred because the account address is now returned in lowercase and that generates an incorrect internal state.

Test scenarios

• First, check that this is actually a bug. Follow the instructions here: WalletConnect is broken on Testnet #636
• Then repeat the same steps but using this link

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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