[api] fix openapi spec: avoid duplicated operationId for get account events by event handle field identifier
[api] fix openapi spec: avoid duplicated operationId for get account events by event handle field identifier

libra/libra,aptos-labs/aptos-core,libra/libra,aptos-labs/aptos-core,aptos-labs/aptos-core,aptos-labs/aptos-core,aptos-labs/aptos-core,libra/libra,aptos-labs/aptos-core,libra/libra,libra/libra,aptos-labs/aptos-core