backend: fix a possible issue when deploying via WSGI
backend: fix a possible issue when deploying via WSGI

The root path might be fixed to /var/www which makes templates unavailable..

walachey/football-worldcup-simulator,walachey/football-worldcup-simulator-comp,walachey/football-worldcup-simulator,walachey/football-worldcup-simulator-comp,walachey/football-worldcup-simulator,walachey/football-worldcup-simulator,walachey/football-worldcup-simulator-comp,walachey/football-worldcup-simulator-comp,walachey/football-worldcup-simulator