Minor style tweaks for Evolution

[Matthew Barnes <mbarnes redhat com>]

Cosimo Cecchi submitted a couple nice style tweaks for Evolution in
https://bugzilla.gnome.org/show_bug.cgi?id=671509

Would be nice to get them in Evolution 3.4.

Screenshots are included in the bug.  The changes are hardly noticeable
if you're not looking for them, but given recent discussions about this
kind of thing I thought I'd best ask first.

Matthew Barnes