[MEDIUM] acbu_minting: Redundant double admin auth in admin_drip_fiat

[Junman140]

File: �cbu_minting/src/lib.rs, lines 971-976
Severity: MEDIUM

�dmin.require_auth() already proves caller IS the stored admin. Then check_is_admin is guaranteed to return true. Redundant storage read wastes gas. Error UnauthorizedOperator is semantically wrong.

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