Add Thai Baht currency

[nop33]

@tdroxler I get 404 errors from explorer backend for the fiat currency THB

       GET https://backend.mainnet.alephium.org/market/prices/ALPH/charts?currency=thb
        
       POST https://backend.mainnet.alephium.org/market/prices?currency=thb 4

Could we please enable it in the next explorer backend release? Thanks!

TODO:

• Enable THB on explorer backend
• Test that it works fine
• Merge this PR

[changeset-bot]

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