Change default variable for mariadb client program for setting character-set

Faustin Lammlerrequested to merge
stretch into master

The default variable option for mariadb client program is wrong, it should be 'character-sets-dir'.

https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=879099

https://jira.mariadb.org/browse/MDEV-158

Edited by Faustin Lammler

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