Fix the padding/margin of the logo on the about page

[jvoisin]

Your checklist for this pull request

• [x] I've read the contributing guideline.
• [x] I've tested my changes by building and running the project, and testing changed functionality (if applicable)

What is the current behaviour?

With the current logo:

With a custom logo:

What is the new behaviour?

With the current logo:

The margins are a bit wider, but it doesn't really matter, since it makes the page feel less empty anyway.

With a custom logo:

[ITAYC0HEN]

I'd go for a constant margin to the left of the text div, so the distance between the most-right of the logo and the most-left of the text will always be the same. Personally I favor it over a wider distance