[panda-syntax theme] Fix rule for matching brackets
[panda-syntax theme] Fix rule for matching brackets

Closes #4230

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