news: fix value of profiles_base

This fixes matching profile paths in Display-If-Profile in news items.

bad: kwargs['profile']='var/db/repos/gentoo/profiles/default/linux/amd64/17.1/hardened', self.profile='default/linux/amd64/17.1/hardened'
good: kwargs['profile']='default/linux/amd64/17.1/hardened', self.profile='default/linux/amd64/17.1/hardened'

os.path.join() treats paths differently based on the components given:
'os.path.join(portdir, "profiles", os.path.sep)' passes 3 different paths,
whereas before 64d84ce, and now, we concat.
profiles and os.path.sep first so that further splitting isn't carried out.

Thanks to kurly for noticing a recent news item wasn't showing up.

Fixes: 64d84ce
Signed-off-by: Sam James <sam@gentoo.org>

lib/portage/news.py

@@ -79,7 +79,7 @@ def __init__(self, portdb, vardb, news_path, unread_path, language_id="en"):
         portdir = portdb.repositories.mainRepoLocation()
         profiles_base = None
         if portdir is not None:
-            profiles_base = os.path.join(portdir, "profiles", os.path.sep)
+            profiles_base = os.path.join(portdir, ("profiles" + os.path.sep))
         profile_path = None
         if profiles_base is not None and portdb.settings.profile_path:
             profile_path = normalize_path(