Unify webpack config

apps/accessibility/webpack.js

apps/comments/webpack.js

apps/files_sharing/webpack.js

apps/files_trashbin/webpack.js

apps/files_versions/webpack.js

apps/oauth2/webpack.js

apps/systemtags/webpack.js

apps/twofactor_backupcodes/webpack.js

apps/updatenotification/js/updatenotification.js

apps/updatenotification/js/updatenotification.js.map

apps/updatenotification/src/components/root.vue

apps/updatenotification/webpack.js

apps/workflowengine/webpack.js

core/webpack.js

settings/webpack.js

webpack.common.js