AuraSpell#openPositionFarm uses incorrect join type for balancer
The JoinPoolRequest uses "" for userData meaning that it will decode into 0. This is problematic because join requests of type 0 are "init" type joins and will revert for pools that are already initialized.\\n```\\nenum JoinKind { INIT, EXACT_TOKENS_IN_FOR_BPT_OUT, TOKEN_IN_FOR_EXACT_BPT_OUT }\\n```\\n\\nWe see above that enum JoinKind is INIT for 0 values.\\n```\\n        return _joinExactTokensInForBPTOut(balances, normalizedWeights, userData);\\n    } else if (kind == JoinKind.TOKEN_IN_FOR_EXACT_BPT_OUT) {\\n        return _joinTokenInForExactBPTOut(balances, normalizedWeights, userData);\\n    } else {\\n        _revert(Errors.UNHANDLED_JOIN_KIND);\\n    }\\n```\\n\\nHere user data is decoded into join type and since it is "" it will decode to type 0 which will result in a revert.
Uses JoinKind = 1 for user data
Users will be unable to open any farm position on AuraSpell
```\\nenum JoinKind { INIT, EXACT_TOKENS_IN_FOR_BPT_OUT, TOKEN_IN_FOR_EXACT_BPT_OUT }\\n```\\n