[solarized theme] Remove overly low-contrast color for cm-strong
[solarized theme] Remove overly low-contrast color for cm-strong

Closes #5075

namin/CodeMirror,dperetti/CodeMirror,hackmdio/CodeMirror,dperetti/CodeMirror,notepadqq/CodeMirror,mtaran-google/CodeMirror,SidPresse/CodeMirror,mtaran-google/CodeMirror,SidPresse/CodeMirror,ficristo/CodeMirror,thomasjm/CodeMirror,pabloferz/CodeMirror,nightwing/CodeMirror,dperetti/CodeMirror,jkaplon/CodeMirror,namin/CodeMirror,SidPresse/CodeMirror,notepadqq/CodeMirror,hackmdio/CodeMirror,thomasjm/CodeMirror,wingify/CodeMirror,notepadqq/CodeMirror,ficristo/CodeMirror,jkaplon/CodeMirror,codio/CodeMirror,wingify/CodeMirror,ficristo/CodeMirror,nightwing/CodeMirror,hackmdio/CodeMirror,nightwing/CodeMirror,mtaran-google/CodeMirror,codio/CodeMirror,namin/CodeMirror,pabloferz/CodeMirror,jkaplon/CodeMirror,pabloferz/CodeMirror,codio/CodeMirror,wingify/CodeMirror,thomasjm/CodeMirror