Bug 17902: Fix possible SQL injection in serials editing

Bug 17902: Fix possible SQL injection in serials editing

/cgi-bin/koha/serials/serials-edit.pl?serstatus=*/+,2,3,'2016-12-12','2016-12-12',6,'jjj7','jjj8'%20--%20-&subscriptionid=1+and+1%3d2+Union+all+select+111+/*

The SQL query is not constructed correctly, placeholders must be used.
Subscription id and status list can be provided by the user.

This vulnerability has been reported by MDSec.

Signed-off-by: Mirko Tietgen <mirko@abunchofthings.net>
Signed-off-by: Nick Clemens <nick@bywatersolutions.com>
Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>