Bug 34979: Sort sysprefs.sql alphabetically

Bug 34979: Sort sysprefs.sql alphabetically

This doesn't add or remove any entries, but only changes
the sequence of entries to be alphabetic again, compared
to:

SELECT variable FROM systempreferences ORDER BY variable;

Signed-off-by: David Nind <david@davidnind.com>
Signed-off-by: Victor Grousset/tuxayo <victor@tuxayo.net>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
Signed-off-by: Katrin Fischer <katrin.fischer@bsz-bw.de>
(cherry picked from commit 24249e264727f76b2e471448eb601daa60cac449)
Signed-off-by: Fridolin Somers <fridolin.somers@biblibre.com>