Update OHM address

[Felix0x]

Updated OHM token address. Previous address has been deprecated a while ago (logo remains the same)

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[Felix0x]

I have read the CLA Document and I hereby sign the CLA

[Felix0x]

recheck

[alfetopito]

Hi @Felix0x thanks a lot for this PR!

A few questions regarding the change:

1. What happens to the old token?
2. Should people still be able to buy it?
3. Should people still be able to sell it?
4. How will users know it's a new version of the token?
5. Will the token image remains exactly the same for both versions?

[Felix0x]

1. The old token is fully deprecated at this point. The migration from v1 to v2 was finished >1 year ago. Users still holding v1 can still migrate from the old token to the new token, but otherwise it's not used anymore.

2 & 3. There are still some very small pools available for the v1 token. So theoretically users can still trade those by manually adding in the address, but it shouldn't be the default option. The vast majority of holders and traders today know only of the current ("v2") token.

4. Since the migration was finished >1 year ago, almost all users have migrated already. All liquidity pools, integrations, and token listings are with the new token contract. If someone is still holding a v1 token they will be prompted to migrate when connecting to the Olympus website.

5. Yes the logo is the same. See for example https://etherscan.io/token/0x383518188c0c6d7730d91b2c03a03c837814a899 (old) and https://etherscan.io/token/0x64aa3364f17a4d01c6f1751fd97c2bd3d7e7f1d5 (new)

[alfetopito]

@Felix0x thanks for the response.
It makes sense, I'll perform the replacement.

Also, I updated the token image as it was broken for some reason