Vikunja: fold the package's service block into the config's service section

Since 2.7.1 the deb's postinst appends a live service: block with the secret, so uncommenting the stock service: line left two service keys and Vikunja fell back to its defaults. Updates merge the duplicate on existing installs.

ct/vikunja.sh

@@ -47,6 +47,13 @@ function update_script() {
     [[ "$CONFIRM2" =~ ^[yY]$ ]] || exit 0
   fi
 
+  if [[ $(grep -c '^service:' /etc/vikunja/config.yml || true) -gt 1 ]]; then
+    msg_info "Merging duplicate service section in config.yml"
+    sed -i '0,/^service:/!{/^service:/d}' /etc/vikunja/config.yml
+    systemctl restart vikunja
+    msg_ok "Merged duplicate service section in config.yml"
+  fi
+
   if check_for_gh_release "vikunja" "go-vikunja/vikunja"; then
     echo
     msg_warn "The package update may include config file changes."

install/vikunja-install.sh

@@ -17,6 +17,7 @@ fetch_and_deploy_gh_release "vikunja" "go-vikunja/vikunja" "binary" "latest" ""
 
 msg_info "Setting up Vikunja"
 sed -i 's|^# \(service:\)|\1|' /etc/vikunja/config.yml
+sed -i '0,/^service:/!{/^service:/d}' /etc/vikunja/config.yml
 sed -i "s|^  # \(publicurl: \).*|  \1\"http://$LOCAL_IP\"|" /etc/vikunja/config.yml
 sed -i "0,/^  # \(timezone: \).*/s||  \1${tz}|" /etc/vikunja/config.yml
 systemctl enable -q --now vikunja