Bug 7143: spaces in history.txt instead of tabs break display on website

This may be the only place in koha where a tab should be a tab and not 4 spaces.

I'll try to fix the script that does the conversion for the website to handle 4 spaces instead of tabs, but for now can we have this?

Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>
Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>