forked from Qortal/qortal
Before: 0-fee self-share REWARD_SHARE when there is an existing self-share would result in INSUFFICIENT_FEE from isFeeValid() After: isFeeValid() returns OK for above, but isValid() returns SELF_SHARE_EXISTS. In addition, a transaction that tries to modify existing self-share, even with fee, also returns SELF_SHARE_EXISTS. Improved tests to double check.