Add zero address check for asset issuer ID in erc20 gateway v4

[viraj124]

• closes https://github.com/FuelLabs/fuel-bridge/issues/231

[github-actions[bot]]

This PR is published in NPM with version ****

[DefiCake]

Sorry I might have needed to be more explicit, but we need the check when doing deposits, not when configuring the value.

In fact, a zero value for the setter might be useful to disable deposits altogether

[viraj124]

Sorry I might have needed to be more explicit, but we need the check when doing deposits, not when configuring the value.

In fact, a zero value for the setter might be useful to disable deposits altogether

I see I thought it's better to add the check in the setter tather than multiple deposit methods will update