Set initial value for suggest_categories setting
Set initial value for suggest_categories setting

Otherwise users may get an error if they somehow load the dashboard
twice in parallel as both requests will try to insert the setting,
violating the uniqueness constraint.

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