Bug 12507 - News does not always display in staff or OPAC

Bug 12507 - News does not always display in staff or OPAC

News will not display on the last day of each month due to the
way the date is calculated in the SQL code for grabbing news.

Test Plan:
1) Create a news item that should display
2) Change your server's date to the last day of the month
3) Note you can no longer see that news item
4) Apply this patch
5) Note you can now see your news item again

Signed-off-by: Owen Leonard <oleonard@myacpl.org>
Signed-off-by: Katrin Fischer <Katrin.Fischer.83@web.de>
Signed-off-by: Tomas Cohen Arazi <tomascohen@gmail.com>