[trivial] remove duplicate definition of HOLDER_ACCOUNT variable

Author: ckeshava

tests/unit/models/transactions/test_amm_clawback.py

@@ -9,7 +9,6 @@
 from xrpl.models.transactions.amm_clawback import AMMClawbackFlag
 
 _ISSUER_ACCOUNT = "r9LqNeG6qHxjeUocjvVki2XR35weJ9mZgQ"
-_HOLDER_ACCOUNT = "rNZdsTBP5tH1M6GHC6bTreHAp6ouP8iZSh"
 _MPT_ISSUANCE_ID_1 = "00000001A407AF5856CECE4281FED12B7B179B49A4AEF506"
 _MPT_ISSUANCE_ID_2 = "00000002A407AF5856CECE4281FED12B7B179B49A4AEF506"
 _ASSET2 = XRP()