[bug] Hashtags inside markdown pre-blocks are rendered as HTML links

[illfygli]

Describe the bug with a clear and concise description of what the bug is.

Posting this:

```
hej hej #hej #hej
```

Results in this:

hej hej <a href="https://doma.in/tags/hej" class="mention hashtag" rel="tag">#<span>hej</span></a> <a href="https://doma.in/tags/hej" class="mention hashtag" rel="tag">#<span>hej</span></a>

What's your GoToSocial Version?

0.4.0-rc2

GoToSocial Arch

amd64 binary

What happened?

The comment character in the code block turned into links, but not actual links, just HTML within the code block.

What you expected to happen?

No links should be there.

How to reproduce it?

Post

```
Anything #thisWillBecomeALink
```

Anything else we need to know?

You are nice and good.