Fix event category filter

Note: You have to set the category mode in the sf_event_mgt plugin to "show selected categories (or)" instead of "ignore category selection"
3 jobs for 217-category-selector-does-not-work in 4 minutes and 8 seconds (queued for 1 second)
Status Name Job ID Coverage
  Test
passed test:php #10098

00:00:16

 
  Build
passed build #10099

00:01:49

 
  Layout
passed layout #10100

00:02:02