Fix some non-autocorrectable linting issues

Many functions in submission_controller.rb still are very long and have
a high complexity. Because the logic for handling execution of
submissions will probably move elsewhere (when switching to
ActionCable), this is fine for now.

lib/runner/runner.rb

@@ -50,8 +50,7 @@ class Runner
   end
 
   def status
-    # parse(Faraday.get(runner_url))[:status].to_sym
-    # TODO return actual state retrieved via websocket
+    # TODO: return actual state retrieved via websocket
     :timeouted
   end