Improve spacing in IRC format template
This consistently gives us exactly one line between items in the
IRC template, whether proposed or accepted and whether they have
ticket votes or not. Currently we get a space between proposed
items without a ticket vote, but no spaces between any other
items. The space was 'accidental' but kind of useful, this makes
it consistent.
Unfortunately it's kinda not obvious how it works (it's to do
with jinja's rather odd whitespace control) and it's not really
possible to do inline comments in jinja to explain it, so people
may look at this code and wonder why it's the way it is, but I
can't see a way around that.
Signed-off-by: Adam Williamson <awilliam@redhat.com>