Cosmetic enhancement

[Keyrxng]

Resolves #155

• Hide everything by default so we don't see a flicker on load
• Do nothing as the box underneath covers errors etc
• Replaced only the checkPermitClaimable() error msg as we see it twice, once in the admin invalidate function so left that as that's grammatically correct

[0x4007]

Code looks mostly fine. Were you able to test it?

[Keyrxng]

Passing an empty array then an array with two objects simulating the claimTxs for QA purposes

[rndquu]

Works fine:

1. Error text is updated
2. The "1/1 Reward" block is hidden if there is only 1 permit