Bug 18832: Missing space between icon and label in button 'Patron lists'

Bug 18832: Missing space between icon and label in button 'Patron lists'

On page Home > Patrons the button 'Patron lists' misses a space between
icon and text. This patch adds it to make the button display like the other
ones.

To test, apply patch and verify that the button displays as expected.

Signed-off-by: fcouffignal <fcouffignal@gmail.com>
Signed-off-by: Julian Maurice <julian.maurice@biblibre.com>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>