Fix broken spec and linting errors

spec/controllers/queries_controller_spec.rb

@@ -362,4 +362,3 @@ describe DataExplorer::QueryController do
     end
   end
 end
-

spec/guardian_spec.rb

@@ -1,7 +1,11 @@
+# frozen_string_literal: true
+
 require 'rails_helper'
 
 describe Guardian do
 
+  before { SiteSetting.data_explorer_enabled = true }
+
   def make_query(group_ids = [])
     q = DataExplorer::Query.new
     q.id = Fabrication::Sequencer.sequence("query-id", 1)