fetch ERC20 token decimals when changing token address #474
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When an ERC20 token was selected as the payment method, its decimals were not being updated correctly and defaulted to 18. This caused failures (wrong allowance and wrong amount when creating job) for tokens that use a different number of decimals. E.g., 6 decimals for EURC. This PR ensures that the decimals are refreshed whenever the token address changes.
Fixes #473