2811 preserve params on clearfilter

#2811 Clear Filters button should preserve custom query params
It's needed but in a different way:
https://github.com/colszowka/phantomjs-gem#usage-with-poltergeistcapybara
```ruby
group :test do
    gem 'poltergeist'
    gem 'phantomjs', :require => 'phantomjs/poltergeist'
end
```