USER_DRIVER_LIST has incorrect driver name

[Oliver Klee]

The default file /etc/backup2l.conf contains this line:

# registering custom drivers below for use as CREATE_DRIVER (optional)
#USER_DRIVER_LIST="DRIVER_MY_AFIOZ DRIVER_MY_AFIOBZ2 DRIVER_GZ_SPLIT DRIVER_ZIP"

The driver DRIVER_GZ_SPLIT does not exist, though. Instead, it needs to be DRIVER_TAR_GZ_SPLIT.

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: backup2l 1.5-8
ProcVersionSignature: Ubuntu 4.4.0-34.53-generic 4.4.15
Uname: Linux 4.4.0-34-generic x86_64
NonfreeKernelModules: nvidia_uvm nvidia_drm nvidia_modeset nvidia
ApportVersion: 2.20.1-0ubuntu2.1
Architecture: amd64
CurrentDesktop: KDE
Date: Mon Aug 15 22:40:05 2016
Dependencies:
 bzip2 1.0.6-8
 gcc-6-base 6.0.1-0ubuntu1
 libbz2-1.0 1.0.6-8
 libc6 2.23-0ubuntu3
 libgcc1 1:6.0.1-0ubuntu1
InstallationDate: Installed on 2016-08-06 (9 days ago)
InstallationMedia: Kubuntu 16.04.1 LTS "Xenial Xerus" - Release amd64 (20160719)
PackageArchitecture: all
SourcePackage: backup2l
UpgradeStatus: No upgrade log present (probably fresh install)
modified.conffile..etc.backup2l.conf: [modified]
mtime.conffile..etc.backup2l.conf: 2016-08-15T15:30:49.738219