Template Export missing Graph Template columns `multiple` and `test_source`

[TheWitness]

Describe the bug

When testing some recent package changes, it turns out that the default for multiple and test source are missed during export.

To Reproduce

Steps to reproduce the behavior:

1. Export a Device Template

2. Re-import it and not the changes multiple and test_source

3. See error

Expected behavior

Cacti should be catching these settings

[TheWitness]

All ported to 1.3.x now.