Let users add new template from the choose page

Since we’re letting users add new folders directly from the choose page
it makes sense that they should also be able to add templates from
there.

This resolves the problem we saw in user research where people found it
hard to know where to go to add a new folder when they were all behind
one green button.

tests/app/main/views/test_template_folders.py

@@ -785,7 +785,7 @@ def test_should_show_radios_and_buttons_for_move_destination_if_correct_permissi
         'main.choose_template',
         service_id=SERVICE_ONE_ID,
     )
-    radios = page.select('input[type=radio]')
+    radios = page.select('#move_to_folder_radios input[type=radio]')
     radio_div = page.find('div', {'id': 'move_to_folder_radios'})
     assert radios == page.select('input[name=move_to]')
 
@@ -799,7 +799,8 @@ def test_should_show_radios_and_buttons_for_move_destination_if_correct_permissi
         'unknown',
         'move_to_existing_folder',
         'move_to_new_folder',
-        'add_new_folder'
+        'add_new_folder',
+        'add_template',
     }