Bug 23997: Escape z3950servers.rank as it's a new MySQL 8 kw

Bug 23997: Escape z3950servers.rank as it's a new MySQL 8 kw

This patch will fix installation of Koha on MySQL 8
DBD::mysql::st execute failed: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'rank, syntax, encoding,recordtype) VALUES
('lx2.loc.gov',210,'LCDB','','','LIBRA' at line 2 at /usr/share/perl5/DBIx/RunSQL.pm line 273.

https://dev.mysql.com/doc/refman/8.0/en/keywords.html
=> RANK (R); added in 8.0.2 (reserved)

Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>