fix quote plugin's handling of negative quote numbers
fix quote plugin's handling of negative quote numbers

df-5/skybot,craisins/nascarbot,cmarguel/skybot,crisisking/skybot,craisins/wh2kbot,olslash/skybot,Jeebeevee/DouweBot_JJ15,TeamPeggle/ppp-helpdesk,SophosBlitz/glacon,parkrrr/skybot,Jeebeevee/DouweBot,isislab/botbot,rmmh/skybot,jmgao/skybot,callumhogsden/ausbot,elitan/mybot,andyeff/skybot,ddwo/nhl-bot,Teino1978-Corp/Teino1978-Corp-skybot