Fix for Bug 6640, Locations not showing in circ reports

Fix for Bug 6640, Locations not showing in circ reports

An invalid template syntax for defining a variable's default
value is found in the circ report template and several
others:

[% DEFAULT LibraryNameTitle="Koha Online" %]

Based on the T:T docs this appears to be the correct way of defining
a default value:

[% LibraryNameTitle or "Koha Online" %]

Reference:

http://template-toolkit.org/docs/manual/Syntax.html#section_Implicit_Directives_GET_and_SET

Signed-off-by: Nicole Engard <nengard@gmail.com>
Signed-off-by: Chris Cormack <chrisc@catalyst.net.nz>