Change fixture bug 3.5.1

Hi

Spotted this on both Hog4PC and a Fullboar4
When changing any fixture from SGM X5 strobe 7ch legacy, the fixture is cloned and the changed leaving the original in place
Eg 301>304 SGM X5 strobe 7ch legacy, change type to Martin Atomics mode 4 creates 401> 404 with 301>304 still being X5s