fbserver, kb_add: Deduplicate keys
fbserver, kb_add: Deduplicate keys

Sometimes trying to be too smart hurts... Long presses on a single
key filled up the array, and crashed the server...

With this, we check if the key is already recorded before adding
it.

armgong/chroagh,DanDanBu/crouton,JDGBOLT/chroagh,mkasick/crouton,djmrr/crouton,taterbase/crouton,ikaritw/crouton,nromsdahl/crouton,zofuthan/crouton,arbuztw/crouton,djmrr/crouton,Timvrakas/crouton,twmccart/crouton,VandeurenGlenn/crouton,djmrr/crouton,stephen-soltesz/crouton,taterbase/crouton,elkangaroo/chroagh,StrawnPoint04/crouton,taterbase/crouton,VandeurenGlenn/crouton,djmrr/crouton,nromsdahl/crouton,StrawnPoint04/crouton,ikaritw/crouton,arbuztw/crouton,arbuztw/crouton,brayniac/crouton,StrawnPoint04/crouton,dragon788/chroagh,armgong/chroagh,fxcebx/crouton,VandeurenGlenn/crouton,dragon788/chroagh,rperce/chroagh,zofuthan/crouton,taterbase/crouton,VandeurenGlenn/crouton,brayniac/crouton,zofuthan/crouton,fxcebx/crouton,tedm/crouton,dnschneid/crouton,jamgregory/crouton,armgong/chroagh,fxcebx/crouton,tonyxue/cruise,dragon788/chroagh,fxcebx/crouton,dragon788/chroagh,DanDanBu/crouton,tedm/crouton,ikaritw/crouton,VandeurenGlenn/crouton,JDGBOLT/chroagh,twmccart/crouton,tedm/crouton,stephen-soltesz/crouton,zofuthan/crouton,brayniac/crouton,mkasick/crouton,elkangaroo/chroagh,rperce/chroagh,Timvrakas/crouton,mkasick/crouton,rperce/chroagh,stephen-soltesz/crouton,twmccart/crouton,Timvrakas/crouton,StrawnPoint04/crouton,DanDanBu/crouton,jamgregory/crouton,tonyxue/cruise,dnschneid/crouton,mkasick/crouton,nromsdahl/crouton,stephen-soltesz/crouton,dnschneid/crouton,DanDanBu/crouton,VandeurenGlenn/crouton,arbuztw/crouton,elkangaroo/chroagh,nromsdahl/crouton,dnschneid/crouton,Timvrakas/crouton,ikaritw/crouton,elkangaroo/chroagh,dragon788/chroagh,zofuthan/crouton,stephen-soltesz/crouton,armgong/chroagh,zofuthan/crouton,DanDanBu/crouton,tonyxue/cruise,tedm/crouton,tonyxue/cruise,taterbase/crouton,ikaritw/crouton,JDGBOLT/chroagh,ikaritw/crouton,mkasick/crouton,mkasick/crouton,tonyxue/cruise,brayniac/crouton,fxcebx/crouton,twmccart/crouton,arbuztw/crouton,StrawnPoint04/crouton,djmrr/crouton,JDGBOLT/chroagh,armgong/chroagh,StrawnPoint04/crouton,tedm/crouton,dragon788/chroagh,nromsdahl/crouton,Timvrakas/crouton,brayniac/crouton,DanDanBu/crouton,JDGBOLT/chroagh,djmrr/crouton,stephen-soltesz/crouton,taterbase/crouton,elkangaroo/chroagh,tonyxue/cruise,Timvrakas/crouton,elkangaroo/chroagh,nromsdahl/crouton,tedm/crouton,dnschneid/crouton,dnschneid/crouton,fxcebx/crouton,jamgregory/crouton,brayniac/crouton,jamgregory/crouton,twmccart/crouton,twmccart/crouton,arbuztw/crouton,jamgregory/crouton,rperce/chroagh,rperce/chroagh,jamgregory/crouton,armgong/chroagh,rperce/chroagh,JDGBOLT/chroagh