The html_remove_elements configuration option does not correctly handle self-closing HTML tags.

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Manticore 2.8.2 on CentOS 7

~ $ searchd -v
Manticore 2.8.2 4e81114@190402 release
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# Describe the problem

The `html_remove_elements` configuration option does not correctly handle self-closing HTML tags.

**Steps to reproduce:**

With a configuration like this:
```conf
html_remove_elements = style, script, img, meta
```
If we try to index this HTML:
```html





Tokens that should be correctly indexed


```

manticore won't index any token. If the meta tag is closed like this `` it will work as expected. We think that Manticore is removing all the HTML after the meta tag, not detecting that meta is a self-closing tag, so it doesn't need a tag.

Reproduce the issue using the shown html_remove_elements configuration and HTML sample, comparing an unclosed meta tag with a self-closing one. Trace the implementation of html_remove_elements and verify that tokens after a self-closing tag are indexed while the configured element is removed.

Written by the indexing model from the issue text.