moves let variable to it statement by using a local variable

spec/requests/api/projects_spec.rb

@@ -82,12 +82,12 @@ describe API::API, api: true  do
       end
 
       context 'GET /projects?simple=true' do
-        let(:keys) { ["id", "http_url_to_repo", "web_url", "name", "name_with_namespace", "path", "path_with_namespace", "permissions"] }
         it 'should return a simplified version of all the projects' do
+          expected_keys = ["id", "http_url_to_repo", "web_url", "name", "name_with_namespace", "path", "path_with_namespace", "permissions"]
           get api('/projects?simple=true', user)
           expect(response).to have_http_status(200)
           expect(json_response).to be_an Array
-          expect(json_response.first.keys).to match_array keys
+          expect(json_response.first.keys).to match_array expected_keys
         end
       end