Bug 27351: Fix UsageStatsCountry system preference wrong type

Bug 27351: Fix UsageStatsCountry system preference wrong type

UsageStatsCountry system preference type 'YesNo' is wrong since it has
several values.
Change to 'Choice'.
Looks like this error whas only in updatedabase 3.17.00.030.

Test plan :
1) Run atomic update
2) Check in database 'UsageStatsCountry' system preference type is
   'Choice'

Signed-off-by: Owen Leonard <oleonard@myacpl.org>
Signed-off-by: Nick Clemens <nick@bywatersolutions.com>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
(cherry picked from commit bbab6615637c60c757df79bdc695a606622ed96a)
Signed-off-by: Fridolin Somers <fridolin.somers@biblibre.com>