fix(tokemak): Remove claimable balance of "Staked TOKE" label

[zeJabun]

Description

Remove the claimable balance within "Staked Toke" since it will always equal to zero. All rewards earned on Tokemak are aggregated and are shown under the "Claimable TOKE" label.

Checklist

• [⚡️] I have followed the Contributing Guidelines
• [⚡️] (optional) As a contributor, my Ethereum address/ENS is: jabun.eth

How to test?

0x9e0bce7ec474b481492610eb9dd5d69eb03718d5
The address above should no longer show a balance named "Claimable" in the Staked TOKE label.

[immasandwich]

Hey @zeJabun ! Easier solution would be just to filter in the current getBalances function such that:

const tokens = [stakedTokenBalance, ...rewardTokenBalances].filter(v => v.balanceUSD > 0);
const balanceUSD = sumBy(tokens, t => t.balanceUSD);

That way, we'd have much less code in the balance helper.