Add libmoosex-fileattribute-perl to Build-Depends

Required for running tests:

|    dh_auto_test
| Subroutine Sipwise::Base::CLASS redefined at /usr/share/perl5/CLASS.pm line 20.
| Can't locate MooseX/FileAttribute.pm in your Perl library.  You may need to install it
| from CPAN or another repository.  Your library paths are:

debian/control

@@ -13,6 +13,7 @@ Build-Depends: debhelper (>= 8),
                libgetopt-long-descriptive-perl,
                libgtk2-gladexml-simple-perl,
                liblog-log4perl-perl,
+               libmoosex-fileattribute-perl,
                libmoosex-nonmoose-perl,
                libmoosex-singleton-perl,
                libparse-debianchangelog-perl,