Bug 14905: Search_utf8.t fails to upload a file

Bug 14905: Search_utf8.t fails to upload a file

Running the test fails on test 7:
not ok 7 - upload succeeded

The changes on bug 14321 included a temp flag for script upload-file.pl.
Since this upload for stage-marc-import should be temporary, adding this
flag to line 131 resolves the problem.

Test plan:
Run the adjusted test.
NOTE: I still had some problems with this test. And will still be looking
to these errors (perhaps open a new report). But this fix should at least
fix the above-mentioned test.

Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>