Bug 36356: Fix rollback from FrameworkPlugin.t

Bug 36356: Fix rollback from FrameworkPlugin.t

rollback ineffective with AutoCommit enabled at /usr/share/perl5/DBIx/Class/Storage/DBI.pm line 1651.

I have not investigated more than that. Reaching this was already the
end of a long road... (see comment 0)

Test plan:
0. Do not apply this patch
1. select count(*) from branches
Note the value
2. Run
  prove t/db_dependent/FrameworkPlugin.t
=> There is a warning
3. Repeat 1.
=> There are too many libraries!
4. Apply the patch, retry 1, 2, 3
=> No warning, no library added by the tests

Signed-off-by: Katrin Fischer <katrin.fischer@bsz-bw.de>
(cherry picked from commit 1d2165f84106cc27b804ac4c347817d25d1403aa)
Signed-off-by: Fridolin Somers <fridolin.somers@biblibre.com>