Remove pending tag cloud test for debates

This feature was only enabled for proposals five years ago, and it
hasn't changed since then. The pending test only gets in the way.

Implement. Or implement not. There is no pending.

spec/models/tag_cloud_spec.rb

@@ -86,8 +86,6 @@ describe TagCloud do
       expect(tag_names(tag_cloud)).to contain_exactly("parks")
     end
 
-    xit "returns tags scoped by category for debates"
-
     it "orders tags by count" do
       3.times { create(:proposal, tag_list: "participation") }
       create(:proposal, tag_list: "corruption")