Bug 23211: Prevent SIP/Transaction.t to fail randomly

Bug 23211: Prevent SIP/Transaction.t to fail randomly

The checkout failed because patron's category is the one used for statistics (category_type=X).

To recreate the failure:
modified: t/db_dependent/SIP/Transaction.t
@ Transaction.t:37 @ subtest fill_holds_at_checkout => sub {
     plan tests => 6;

-    my $category = $builder->build({ source => 'Category' });
+    my $category = $builder->build({ source => 'Category', value => { category_type => 'X' }});
     my $branch   = $builder->build({ source => 'Branch' });
     my $borrower = $builder->build({ source => 'Borrower', value =>{
         branchcode => $branch->{branchcode},

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