Remove separation between upload and send

Now that you can access upload from within the send one off message
flow, it doesn’t need its own linkbutton on the template page.

tests/app/main/views/test_templates.py

@@ -205,12 +205,12 @@ def test_caseworker_redirected_to_one_off(
     ),
     (
         ['send_messages'],
-        ['.send_messages', '.set_sender'],
+        ['.set_sender'],
         None,
     ),
     (
         ['send_messages', 'manage_templates'],
-        ['.send_messages', '.set_sender', '.edit_service_template'],
+        ['.set_sender', '.edit_service_template'],
         None,
     ),
 ])