Fix drawer expanded mode in medium and small screens
Fix drawer expanded mode in medium and small screens

This commit fix the drawer that apperas to be masked by the
conversation view when you expand it.

robinmoussu/cozy-emails,robinmoussu/cozy-emails,nono/cozy-emails,kelukelu/cozy-emails,kelukelu/cozy-emails,aenario/cozy-emails,cozy-labs/emails,cozy-labs/emails,nono/cozy-emails,lemelon/cozy-emails,aenario/cozy-emails,frankrousseau/cozy-emails,poupotte/cozy-emails,lemelon/cozy-emails,clochix/cozy-emails,cozy/cozy-emails,poupotte/cozy-emails,frankrousseau/cozy-emails,cozy/cozy-emails,clochix/cozy-emails