Adjust install targets of systemd service and timer

See: https://progress.opensuse.org/issues/166433

Author: kalikiana

systemd/openqa-trigger-from-obs-update.service

@@ -6,6 +6,3 @@ After=network-online.target
 Type=oneshot
 ExecStart=/usr/bin/git -C /opt/openqa-trigger-from-obs pull --quiet --rebase origin master
 User=geekotest
-
-[Install]
-WantedBy=default.target

systemd/openqa-trigger-from-obs-update.timer

@@ -6,4 +6,4 @@ OnCalendar=*:0/3
 Unit=openqa-trigger-from-obs-update.service
 
 [Install]
-WantedBy=default.target
+WantedBy=timers.target