Replace unnecessary switch block

[lokka30]

This method in EconomyResponse.java can be improved by replacing it with:

/**
 * Checks if an operation was successful
 * @return if the operation was successful
 */
public boolean transactionSuccess() {
    return type == ResponseType.SUCCESS;
}

Didn't write this in an IDE so please check for errors. :)

[lokka30]

My bad, #97 had already done this. Didn't see it.