remove uneeded specs

spec/components/score_calculator_spec.rb

@@ -28,10 +28,6 @@ describe ScoreCalculator do
       expect(topic.score).to be_present
     end
 
-    it "gives the topic a percent_rank" do
-      expect(topic.percent_rank).not_to eq(1.0)
-    end
-
   end
 
   context 'summary' do

spec/models/topic_spec.rb

@@ -1144,7 +1144,6 @@ describe Topic do
     it 'is a regular topic by default' do
       expect(topic.archetype).to eq(Archetype.default)
       expect(topic.has_summary).to eq(false)
-      expect(topic.percent_rank).to eq(1.0)
       expect(topic).to be_visible
       expect(topic.pinned_at).to be_blank
       expect(topic).not_to be_closed