2811 preserve params on clearfilter

2811 Clear Filters button should preserve custom query params
your implementation looks to complicated, I think this should do the same:
```coffeescript
params = window.location.search.split('&')
regex = /_(eq|equals|cont|contains|start|starts_with|end|ends_with|gteq|lteq|present|in|searcher)/

window.location.search = (param for param in params when not param.match(regex))
```