Hide late warning in rb for events
Hide late warning in rb for events

 - Hide the late warning message when booking a room in an event with fixed
   date and time
 - fix #1630

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