fix use of removed escapeHTML in settings.js

[blizzz]

First, this is not a compiled, but a static file.

Second, this is a very pragmatic approach. If someone prefers to wrap it in Webpack/Vue/$other magic, please close and take over, but ensure this is solved within Beta.

To reproduce:

1. Enable an app that registers settings in 'additional' section, like impersonate
2. Visit the settings
3. Try to set something there – JS will error out, because escapeHTML function was removed

Apart of adding a custom escapeHTML function~~, the eslint warnings were fixed, too~~.

[faily-bot]

🤖 beep boop beep 🤖

Here are the logs for the failed build:

Status of 32775: failure

jsunit

Show full log

PhantomJS 2.1.1 (Linux 0.0.0) WARN: 'No OC found'
PhantomJS 2.1.1 (Linux 0.0.0) LOG: 'JQMIGRATE: Migrate is installed, version 1.4.1'
PhantomJS 2.1.1 (Linux 0.0.0) WARN: 'jQuery is deprecated: The global jQuery is deprecated. It will be updated to v3.x in Nextcloud 21. In later versions of Nextcloud it might be removed completely. Please ship your own.'
PhantomJS 2.1.1 (Linux 0.0.0) WARN: '$ is deprecated: The global jQuery is deprecated. It will be updated to v3.x in Nextcloud 21. In later versions of Nextcloud it might be removed completely. Please ship your own.'
PhantomJS 2.1.1 (Linux 0.0.0) WARN: 'Handlebars is deprecated: please ship your own, this will be removed in Nextcloud 20'
PhantomJS 2.1.1 (Linux 0.0.0) DEBUG: 'OCA.Files.Settings initialized'
PhantomJS 2.1.1 (Linux 0.0.0) DEBUG: 'OCA.Files.Sidebar initialized'
PhantomJS 2.1.1 (Linux 0.0.0) DEBUG: 'OCA.Sharing.ShareSearch initialized'
PhantomJS 2.1.1 (Linux 0.0.0) DEBUG: 'OCA.Sharing.ExternalLinkActions initialized'
PhantomJS 2.1.1 (Linux 0.0.0): Executed 847 of 850 (skipped 3) SUCCESS (12.832 secs / 12.237 secs)