Wrong screenshot in 5.5 release announcement

[Jens Reuterberg]

The screenshot from Muon is wrong in the 5.5 release 
announcement and is replaced by a rather glitched version of Muon 

This is the correct image:
https://i.imgur.com/bE1ErYi.jpg

The sooner it can be fixed the better since release announcement is 
getting some nice traction around the linux-sphere and it would be 
a shame if they all started focusing on the wrong thing.