fix(ui): center-align emojis to neighbouring text (#11057)

### Testing

1. Create issue with Emoji next to text, e.g. this is a 🐸 with no ℹ️ Information.
2. Observe that the emoji is not anymore top-aligned to the text.

(Here a test string with Forgejo’s [custom emojis](https://codeberg.org/forgejo/forgejo/src/branch/forgejo/public/assets/img/emoji):  test   TEST  :forgejo: Test  )

- [x] checked on Chromium and Firefox on Linux (ofc) myself
- [x] checked on Firefox on MacOS, https://codeberg.org/forgejo/forgejo/pulls/11057#issuecomment-10182195

Reviewed-on: https://codeberg.org/forgejo/forgejo/pulls/11057
Reviewed-by: Beowulf <beowulf@beocode.eu>
Reviewed-by: 0ko <0ko@noreply.codeberg.org>
Co-authored-by: Robert Wolff <mahlzahn@posteo.de>
Co-committed-by: Robert Wolff <mahlzahn@posteo.de>

web_src/css/markup/content.css

@@ -338,7 +338,6 @@
 
 .markup .emoji {
   max-width: none;
-  vertical-align: text-top;
 }
 
 .markup span.frame {