Source 'selected token' from token list [SBK-298]

[alexisnsns]

in [ui/lib/CreateStream.tsx]:

    <select
      value={selectedToken}
      onChange={(e) => setSelectedToken(e.target.value)}
    >
      <option value="USDC">USDC</option>
      <option value="">Matic (Coming soon)</option>
      <option value="">ETH (Coming soon)</option>
    </select>

Source these values from a token list; https://github.com/Uniswap/token-lists#automated

This would replace props.tokenAddress with a tokenlist to select from

[alexisnsns]

Fixed with #49