Resize logo.png to match the look of other blocks.

[szony]

On the main blocks page icons next to audio and bluetooth blocks look larger compared to other blocks.

Here's the logo file as defined in balena.yml: https://raw.githubusercontent.com/balenablocks/audio/master/logo.png

And here's correctly looking one from fbcp: https://raw.githubusercontent.com/balenablocks/fbcp/master/logo.png

The logos have different size and proportions. Fbcp could be used as a reference.