effective_amount should not be 0 during claim takeover

[neb-b]

The Issue

If I have a claim that was overtaken, I might want to edit it and up my bid amount to try and take control. If I publish something, then decide I want to try and outbid someone (or realized I forgot to do it when publishing initially), I can't compare my effective_amount to a winning claim's effective_amount because mine will be 0.

Steps to reproduce

1. Make a publish to lbry://one
2. Resolve the claim
3. Notice that effective_amount is 0

Expected behaviour

effective_amount should always be the actual effective amount

Needed for lbryio/lbry-desktop#1940

[tzarebczan]

Related discussions: https://github.com/lbryio/lbryum/issues/158 / lbryio/lbrycrd#203 - which means this probably goes all the way back to the blockchain layer.

@seanyesmunt - as a workaround, if the user's claim is returning 0, it means there is another claim (found by resolving the vanity URL) with a higher bid and correct effective amount - this is the bid they would need to beat. In the meantime, we could show their claim bid, not the effective amount, as the current bid (this would work in most situations, besides those that have supports).

[alyssaoc]

closing, reopen if still valid