Update button status when a segment is removed
Update button status when a segment is removed

sometimes removing doesn't cause a selection change, so this update is
necessary

chloe747/LiveSplit,ROMaster2/LiveSplit,Dalet/LiveSplit,zoton2/LiveSplit,Jiiks/LiveSplit,kugelrund/LiveSplit,Fluzzarn/LiveSplit,zoton2/LiveSplit,kugelrund/LiveSplit,zoton2/LiveSplit,Jiiks/LiveSplit,Fluzzarn/LiveSplit,Fluzzarn/LiveSplit,Glurmo/LiveSplit,Dalet/LiveSplit,chloe747/LiveSplit,Dalet/LiveSplit,Jiiks/LiveSplit,kugelrund/LiveSplit,Glurmo/LiveSplit,stoye/LiveSplit,LiveSplit/LiveSplit,PackSciences/LiveSplit,chloe747/LiveSplit,PackSciences/LiveSplit,stoye/LiveSplit,PackSciences/LiveSplit,ROMaster2/LiveSplit,ROMaster2/LiveSplit,Glurmo/LiveSplit,stoye/LiveSplit