Fix RSpec/MultipleSubjects cop (#24738)

spec/controllers/emojis_controller_spec.rb

@@ -8,10 +8,10 @@ describe EmojisController do
   let(:emoji) { Fabricate(:custom_emoji) }
 
   describe 'GET #show' do
-    subject(:response) { get :show, params: { id: emoji.id, format: :json } }
-
     subject(:body) { JSON.parse(response.body, symbolize_names: true) }
 
+    let(:response) { get :show, params: { id: emoji.id, format: :json } }
+
     it 'returns the right response' do
       expect(response).to have_http_status 200
       expect(body[:name]).to eq ':coolcat:'