Setting default Custom Max Papers weight

[celestemartinez]

Emily made this change about setting the default max papers in the invitation from the deployed configuration. However, I now notice that we don't set the note as deployed until after set_assignments() finishes successfully, so by the time we try to get the deployed configuration, the status has not been changed yet. This means that the default value is not being set.

I think instead of checking which configuration is deployed, we get the configuration with the title we pass to set_assignments(): assignment_title