dialog: increase local cseq after REFER generated by dlg_bridge

- otherwise the next BYE can be rejected

(cherry picked from commit c76ee9facb771d2eae792214e6d4cef39c94a9eb)

Conflicts:
	modules/dialog/dlg_transfer.c
pkg/rpm: version set to 4.0.7 in spec files
pkg/deb: version set to 4.0.7 in spec files
pkg/fedora: version set to 4.0.7 in spec file
Makefile.defs: version set to 4.0.7
ChangeLog: content updated for v4.0.7