engine: Correct timezone offset for Sri Lanka

The offset should be GMT+05:30 instead of GMT+06:00

Change-Id: I2243780f409443e6d9a59eb89b30076a47ae1707
Bug-Url: https://bugzilla.redhat.com/show_bug.cgi?id=1045681
Signed-off-by: Martin Betak <mbetak@redhat.com>