Light-client: Don't mint (only deposit) to UDC when not on a test net

[nephix]

Thanks for filing a bug report :-)

Steps to Reproduce

1. Serve dApp
2. Connect (not to a test net)
3. Click on a token
4. Acquire some SVT
5. Try to deposit in dApp

Expected Result

• We already have SVT in the account and can deposit

Actual Result

• Currently it should fail because minting is only allowed on test nets
• Depositing may fail as well because minting failed

[nephix]

According to @kelsos this should not happen because we skip minting if we already have sufficient SVT

[kelsos]

@nephix while this is true we should also check if mainnet
https://github.com/raiden-network/light-client/blob/842352ee3f8418d3b6eed71eab365a36dda43da3/raiden-dapp/src/components/dialogs/MintDepositDialog.vue#L129

I think this issue is valid :)

[nephix]

Ok lets keep it open then :)