harmonise tar xzf commands

build/scripts/backintime.sh

@@ -7,7 +7,7 @@ apt_install_permanent gettext python3 python3-dbus
 ## Back In Time
 cd /opt
 wget https://github.com/bit-team/backintime/releases/download/v$BACKINTIME_VERSION/backintime-$BACKINTIME_VERSION.tar.gz
-tar zxvf backintime-$BACKINTIME_VERSION.tar.gz
+tar xzf backintime-$BACKINTIME_VERSION.tar.gz
 cd backintime-$BACKINTIME_VERSION/common
 ./configure
 make
@@ -18,4 +18,4 @@ sed -i 's,^ssh-agent,,' /usr/bin/backintime
 if [ $MODE == "minimal" ]; then
     cd /opt
     rm -rf backintime-$BACKINTIME_VERSION*
-fi
+fi