Issue #2389515 by nod_: Update ESLint rules

.eslintignore

.eslintrc

core/misc/ajax.js

core/misc/autocomplete.js

core/misc/dialog/dialog.jquery-ui.js

core/misc/dialog/dialog.position.js

core/misc/displace.js

core/misc/drupal.js

core/misc/form.js

core/misc/states.js

core/misc/tabledrag.js

core/misc/tableselect.js

core/misc/timezone.js

core/misc/vertical-tabs.js

core/modules/block_content/js/block_content.js

core/modules/ckeditor/js/ckeditor.admin.js

core/modules/ckeditor/js/ckeditor.drupalimage.admin.js

core/modules/ckeditor/js/ckeditor.js

core/modules/ckeditor/js/ckeditor.stylescombo.admin.js

core/modules/ckeditor/js/plugins/drupalimage/plugin.js