Custom phonebook sources missing from backup

[Stell0]

Steps to reproduce

• create a custom phonebook source from NethVoice interface
• make a backup
• restore the backup

Expected behavior

Custom sources should be saved into backup and restored with it

Actual behavior

Sourced isn't saved into backup

[nethbot]

in 7.9.2009/nethesis-testing:

• nethserver-phonebook-mysql-2.4.1-1.1.g5548e10.ns7.noarch.rpm x86_64

[nethbot]

in 7.9.2009/nethesis-updates:

• nethserver-phonebook-mysql-2.4.2-1.ns7.noarch.rpm x86_64