Removed superfluous destroy line
Removed superfluous destroy line

Line caused errors as evident by issue https://github.com/angular-ui/ui-slider/issues/10 and was removed.
asetiyadi/ui-slider,angular-ui/ui-slider,anoopelias/ui-slider,asetiyadi/ui-slider,angular-ui/ui-slider,kongx73/ui-slider,anoopelias/ui-slider,pallayr/ui-slider,ym/ui-slider,pallayr/ui-slider,douglasduteil/ui-slider,kongx73/ui-slider,brydar/ui-slider,brydar/ui-slider,ym/ui-slider