Fix extra HTTP request on filters change

[blackst0ne]

If a user changes anything in the filters (/events or /analytics page), two HTTP requests will be fired instead of just one.

This is because there is a watcher for $route changes which gets fired both on filters change and on URL change (for example, when walking through links to the same page but with different query params).

Either the watcher or the logic should be changed to get rid of the extra HTTP request.