[FIX] Use correct Flask root_path
[FIX] Use correct Flask root_path

Thanks to indico being a namespace package flask sometimes fails at
determining the package root path correctly

mvidalgarcia/indico,DirkHoffmann/indico,mic4ael/indico,pferreir/indico,DirkHoffmann/indico,DirkHoffmann/indico,pferreir/indico,DirkHoffmann/indico,ThiefMaster/indico,indico/indico,ThiefMaster/indico,OmeGak/indico,indico/indico,mvidalgarcia/indico,mic4ael/indico,indico/indico,mic4ael/indico,mvidalgarcia/indico,OmeGak/indico,ThiefMaster/indico,pferreir/indico,pferreir/indico,ThiefMaster/indico,mvidalgarcia/indico,OmeGak/indico,OmeGak/indico,mic4ael/indico,indico/indico