Revert "dom0/qvm-prefs: remove duplicated set_include_in_backups"
Revert "dom0/qvm-prefs: remove duplicated set_include_in_backups"

This reverts commit aa99c411db89c98dcc22a664753b6b63efd53d3d.
This wasn't duplicated...

Conflicts:

	dom0/qvm-tools/qvm-prefs

woju/qubes-core-admin,QubesOS/qubes-core-admin,QubesOS/qubes-core-admin,woju/qubes-core-admin,marmarek/qubes-core-admin,marmarek/qubes-core-admin,marmarek/qubes-core-admin,woju/qubes-core-admin,QubesOS/qubes-core-admin,woju/qubes-core-admin