Update the EUR icon and name on Vortex UI

[Sharqiewicz]

Context

Currently the EUR logo is incorrect and shown as anchor icon also the name is for the token not the currency, this ticket is to make changes

Requirement

• Change EURC to EUR
• Change the icon to the attached one in this ticket
• Also change the name in the dropdown to EUR

Done

✅ Implement fiat property which can be used to show the fiat equivalent of the crypto asset ✅ fix: show USDC icon when no chain is selected (previously the default one was USDC Polygon)

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[Sharqiewicz]

@TorstenStueber I simplified the useGetIcon hook

[prayagd]

All good from my end, we can merge

[TorstenStueber]

I implemented the suggested changes and this PR is ready to be reviewed again.

[prayagd]

LGTM