Update AccessControl.sol

In the renouncRole() function, It needs to also check if the caller already has been assigned a role previously and also send them a custom error message if this is not the case

Author: raymondabiola

contracts/access/AccessControl.sol

@@ -156,7 +156,9 @@ abstract contract AccessControl is Context, IAccessControl, ERC165 {
         if (callerConfirmation != _msgSender()) {
             revert AccessControlBadConfirmation();
         }
-
+      if (!hasRole(role, callerConfirmation)){
+            revert AccessControlUnauthorizedAccount(callerConfirmation, role);
+      }
         _revokeRole(role, callerConfirmation);
     }