fix: remove the filter for claimed rewards in find_rewards_by_delegator_and_validator_and_epoch

[neocybereth]

This was removed here when we were resolving the error where claimed balance wasn't being updated in Namadillo's Unclaimed Staking Balance panel (which was my fault from here.

For this endpoint, however, we don't want to filter the claimed rewards b/c we're querying to find the total rewards a user was paid per epoch. So we mustn't filter claimed rewards b/c otherwise each claimed epoch would give us []

Here's what a successful query looks like:

$ curl -s https://indexer.namada.tududes.com:443/api/v1/pos/reward/tnam1qpumagd04vvc5c8552se32na7wrhvvganc0lj82r/tnam1q8lhvxys53dlc8wzlg7dyqf9avd0vff6wvav4amt/661
[{"minDenomAmount":"66940323","validator":{"address":"tnam1q8lhvxys53dlc8wzlg7dyqf9avd0vff6wvav4amt","votingPower":"10385382","maxCommission":"0.01","commission":"0.05","state":"consensus","name":"ValidityOps#1","email":"operations@validityops.com","website":"https://validityops.com","description":"🛡️Shields Up for Secure and Reliable Staking — Supporting the Namada Ecosystem!","discordHandle":null,"avatar":"https://avatars.githubusercontent.com/u/183962636?s=200&v=4","validatorId":"124","rank":null}}]

Here's what the current query looks like:

$ curl -s https://indexer.namada.tududes.com:443/api/v1/pos/reward/tnam1qr0evqhw9u0yqy9d5zmtq0q8ekckhe2vkqc3ky/tnam1q8lhvxys53dlc8wzlg7dyqf9avd0vff6wvav4amt/660