Markdown rendering "eats" html tags

[icewind1991]

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Steps to reproduce

1. Use talk rc that has markdown support
2. send "<test>" as a message

Expected behaviour

The "<test>" text is visible

Actual behaviour

An empty message shows up

Some properly formatted html messages ("<b>test</b>") only have the tags stripped, while others ("<h1>test</h1>") have both the tag and the content removed during rendering.

Instead of completely removing unsupported tags, it should instead render the html "source" as plain text

[nickvergessen]

    ```
    <b>test</b>
    ```

Should work at the moment. But yeah I agree that showing it "plain" would be better, but that needs fixing in https://github.com/nextcloud-libraries/nextcloud-vue