Remove TODO from AssetPriceSchema (#2211)

Removes an unnecessary TODO comment.

src/datasources/balances-api/entities/asset-price.entity.ts

@@ -2,7 +2,6 @@ import { z } from 'zod';
 
 export type AssetPrice = z.infer<typeof AssetPriceSchema>;
 
-// TODO: Enforce Ethereum address keys (and maybe checksum them)
 export const AssetPriceSchema = z.record(z.record(z.number().nullable()));
 
 export const AssetPricesSchema = z.array(AssetPriceSchema);