Copy over the functionality of filtering by media type from the regular
global search, into film_search.js
Also minor adjustments:
* Add `media_type` label to the details of each card. Ideally we could
unify it with the way it is done inside the gallery. Like showing a
Blender logo for blend files, timestamp for videos, etc. For now
simply show the type in a label.
* Remove "Sort By:" label from the sortby element. It's clear from
context. We could add a "sort" icon using CSS in the future.
* Make all inputs full size. "input-sm" looks weird and it's not needed.
* Move "cancel/clear" button after search. It's not the primary function
so it shouldn't be right next to the text field.
