Boxes: Minor freeze breaks

Hi,

Designers fixed some visual issues in Boxes so need freeze exception:

https://bugzilla.gnome.org/show_bug.cgi?id=754568

Lapo informed me there will likely be some other patches coming soon.
I'd like to remind everyone that Boxes docs have been outdated for a
while now and AFAIK nobody is working on that so these changes will
not affect anyone's work. So what I'm asking for is a free pass for
such minor UI improvements (assuming of course that no strings are
changed) for this week.

-- 
Regards,

Zeeshan Ali (Khattak)
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