refactor(default_query, tests): change .default_query usage and fix test in random order

Tests are now executed in random order. Each test is now further isolated with
    RailsAdmin::Config.reset
    RailsAdmin.config do |c|
      c.included_models = Basepack::Utils.detect_models
    end

BREAKING CHANGE: To set default filter define #default_query_params method in proper
controller. Usage of .default_query will not work any more.