[packaging] sozi should depend on inkscape-trunk package as well

[Ｖ字龍(Vdragon)]

Currently sozi is not co-installable with inkscape-trunk package because it only depends on inkscape package, as long as there's no conflict it should also depend on the trunk version as well

ProblemType: Bug
DistroRelease: Ubuntu 15.10
Package: sozi (not installed)
ProcVersionSignature: Ubuntu 4.2.0-23.28-generic 4.2.6
Uname: Linux 4.2.0-23-generic x86_64
ApportVersion: 2.19.1-0ubuntu5
Architecture: amd64
CurrentDesktop: KDE
Date: Sat Jan 9 21:56:14 2016
InstallationDate: Installed on 2016-01-07 (1 days ago)
InstallationMedia: Ubuntu 15.10 "Wily Werewolf" - Release amd64 (20151021)
JournalErrors:
 No journal files were found.
 -- No entries --
SourcePackage: sozi
UpgradeStatus: No upgrade log present (probably fresh install)