[search addon] Find in extraKeys when handling next/prev command in persistent search
[search addon] Find in extraKeys when handling next/prev command in persistent search

When persistent search dialog is open, looking up commands for findNext/
Prev keys would only search the current keyMap. This commit changes this
to also look up commands in extraKeys

hackmdio/CodeMirror,schanzer/CodeMirror,hackmdio/CodeMirror,alur/CodeMirror,grzegorzmazur/CodeMirror,jayaprabhakar/CodeMirror,mtaran-google/CodeMirror,notepadqq/CodeMirror,nightwing/CodeMirror,ejgallego/CodeMirror,rrandom/CodeMirror,dperetti/CodeMirror,jkaplon/CodeMirror,notepadqq/CodeMirror,adobe/CodeMirror2,wingify/CodeMirror,codio/CodeMirror,INTELOGIE/CodeMirror,codio/CodeMirror,alur/CodeMirror,alur/CodeMirror,ejgallego/CodeMirror,xeronith/CodeMirror,thomasjm/CodeMirror,TDaglis/CodeMirror,MarcelGerber/CodeMirror,namin/CodeMirror,namin/CodeMirror,namin/CodeMirror,pabloferz/CodeMirror,jayaprabhakar/CodeMirror,crazy4chrissi/CodeMirror,kerabromsmu/CodeMirror,nightwing/CodeMirror,notepadqq/CodeMirror,pabloferz/CodeMirror,crazy4chrissi/CodeMirror,schanzer/CodeMirror,schanzer/CodeMirror,mtaran-google/CodeMirror,adobe/CodeMirror2,rrandom/CodeMirror,SidPresse/CodeMirror,SidPresse/CodeMirror,wingify/CodeMirror,TDaglis/CodeMirror,adobe/CodeMirror2,INTELOGIE/CodeMirror,sourcelair/CodeMirror,ejgallego/CodeMirror,jayaprabhakar/CodeMirror,mtaran-google/CodeMirror,xeronith/CodeMirror,thomasjm/CodeMirror,wingify/CodeMirror,codio/CodeMirror,nightwing/CodeMirror,sourcelair/CodeMirror,MarcelGerber/CodeMirror,crazy4chrissi/CodeMirror,grzegorzmazur/CodeMirror,sourcelair/CodeMirror,rrandom/CodeMirror,hackmdio/CodeMirror,jkaplon/CodeMirror,ficristo/CodeMirror,dperetti/CodeMirror,ficristo/CodeMirror,kerabromsmu/CodeMirror,pabloferz/CodeMirror,thomasjm/CodeMirror,INTELOGIE/CodeMirror,ficristo/CodeMirror,kerabromsmu/CodeMirror,SidPresse/CodeMirror,MarcelGerber/CodeMirror,xeronith/CodeMirror,dperetti/CodeMirror,grzegorzmazur/CodeMirror,TDaglis/CodeMirror,jkaplon/CodeMirror