remove unused imports

Author: Krishang Nadgauda

contracts/signature-drop/SignatureDrop.sol

@@ -3,7 +3,6 @@ pragma solidity ^0.8.11;
 
 //  ==========  External imports    ==========
 
-import "@openzeppelin/contracts-upgradeable/access/AccessControlEnumerableUpgradeable.sol";
 import "@openzeppelin/contracts-upgradeable/security/ReentrancyGuardUpgradeable.sol";
 import "@openzeppelin/contracts-upgradeable/utils/MulticallUpgradeable.sol";
 import "@openzeppelin/contracts-upgradeable/utils/StringsUpgradeable.sol";
@@ -14,9 +13,7 @@ import "erc721a-upgradeable/contracts/ERC721AUpgradeable.sol";
 //  ==========  Internal imports    ==========
 
 import "../openzeppelin-presets/metatx/ERC2771ContextUpgradeable.sol";
-
 import "../lib/CurrencyTransferLib.sol";
-import "../lib/FeeType.sol";
 
 //  ==========  Features    ==========