remove displayEmptyReadOnlySession from closeFile

fixed standard

src/app/files/fileManager.js

@@ -103,7 +103,6 @@ class FileManager extends Plugin {
   closeFile (name) {
     delete this.openedFiles[name]
     if (!Object.keys(this.openedFiles).length) {
-      this.editor.displayEmptyReadOnlySession()
       this._deps.config.set('currentFile', '')
       this.events.emit('noFileSelected')
     }