Block move operations display incorrectly in debug window

[mellonpizza]

mvn $bb, $aa is disassembled as mvn $aa, $aa, though otherwise it functions properly in terms of behavior.

[devinacker]

This is fixed in 37c4f6a already, feel free to grab a recent dev build: https://ci.appveyor.com/project/devinacker/bsnes-plus/branch/master/artifacts