time entry form fixes

- issue selection selects the project accordingly
- issue / project selection updates available activities
- move project / issue selector to top. more logical this way, since
making a selection there may change the available activities

config/routes.rb

@@ -1,6 +1,7 @@
 resources :stopwatch_timers, only: %i(new create edit update) do
   collection do
     get :current
+    post :update_form
   end
   member do
     put :start