Remove duplicated test file

While we have been working on this we have ended up with two test files that cover creating assets. Use the more comprehensive file for now and move in the only one that wasn't covered.

Author: zetter-rpf

spec/features/scratch/creating_a_scratch_asset_spec.rb

@@ -380,11 +380,20 @@
       end
     end
 
-    it 'responds 401 unauthorized when user is not part of a school' do
+    it 'responds 401 unauthorized when user is not signed in' do
       post '/api/scratch/assets/example.svg', headers: { 'X-Project-ID' => project.identifier }
 
       expect(response).to have_http_status(:unauthorized)
     end
+
+    it 'responds 404 Not Found when user is not part of a school' do
+      user = create(:user)
+      authenticated_in_hydra_as(user)
+
+      post '/api/scratch/assets/example.svg', headers: project_headers
+
+      expect(response).to have_http_status(:not_found)
+    end
   end
 
   def create_scratch_project(**attributes)