Can't see images in exported chats because they are hidden with style="display:none"

### Steps to reproduce

1. Locate a conversation with images in Element desktop.
2. Click "Export Chat", download and unzip.
4. Verify "images" directory is present and contains the exported images.
5. Open "messages.html" in a browser (I tested with both Firefox and Chromium)
6. Images are not shown in the conversation.
7. Inspect HTML code in "messages.html": tags have style="display:none"

```
% find images
images
images/Screensho-8-22-2024 at 3-01-27 PM.jpg
images/imagejpeg_0-8-22-2024 at 4-57-59 PM.jpg

in messages.html:
63:
65:
```

### Outcome

I expected images to be visible.

But due to style="display:none" they are not. I looked for javascript that would later remove it or resize the image, but did not find any.

### Operating system

NixOS Linux

### Application version

Element version: 1.11.75 Crypto version: Rust SDK 0.7.1 (c8c9d15), Vodozemac 0.6.0

### How did you install the app?

Installed using NixOS derivation

### Homeserver

matrixdotorg/synapse:v1.110.0

### Will you send logs?

Yes

Reproduce the export in Element desktop using a conversation with images, then inspect the Export Chat entry point and the generated messages.html. Compare the exported images directory with the HTML image tags and determine why they receive display:none. Done means exported images are visible when messages.html is opened in Firefox or Chromium.

Written by the indexing model from the issue text.