Remove unneeded fields from StoredBalance and Pool structs
Resolution\\nThis is fixed in 0xProject/0x-monorepo#2248. As part of a larger refactor, these fields were removed.\\nBoth structs have fields that are only written to, and never read:\\nStoredBalance.isInitialized:\\n```\\nbool isInitialized;\\n```\\n\\nPool.initialized:\\n```\\nbool initialized;\\n```\\n
The unused fields should be removed.
```\\nbool isInitialized;\\n```\\n