Bug 20666: Correct executable permissions

Bug 20666: Correct executable permissions

TEST PLAN
---------
On a kohadevbox:
 1) sudo koha-plack --enable kohadev
 2) restart_all
 3) Enter fines for a patron in the staff client
 4) Go to the 'Fines' tab (left pane)
 5) Go to the 'Account' tab (below the row of buttons)
 6) Click 'Details'
    -- no issues
 7) sudo koha-plack --disable kohadev
 8) restart_all
 9) refresh page
    -- Error 500
10) apply patch
11) restart_all
12) refresh page
    -- no issues
13) sudo koha-plack --enable kohadev
14) restart_all
15) refresh page
    -- no issues

Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Julian Maurice <julian.maurice@biblibre.com>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>