#2583 - Fix form filters on /reports/caltrains_promo to work like usual

Redmine

Currently the form doesn't work the way we usually have these sort of report forms work. Usually the way we do these forms with filters is that when the form first appears, it should start with the filters set to the defaults and show the results for those filters. If you adjust the filters and click on "Apply", then it should reload the page with the results for the new values in the filters. You should rename the "Generate" button to "Apply".

Also, you should add a link to the right of the "Generate" button called "CSV" that when clicked starts a CSV download of the data filtered by the current value of the filters.