Fix the interaction between FX_JUMP and FX_BREAK in scan_module().

FX_JUMP should set break_row to 0, as it's already doing during playback.
This also has an effect on the FT2 E60 bug -- FX_JUMP resets the starting
row, undoing the effect of the bug.
Merge pull request #16 from eltoder/scan-module-break-jump

Fix the interaction between FX_JUMP and FX_BREAK in scan_module().