Update pihole.sh to update PiHole service (#2781)

Add pihole update functionality

ct/pihole.sh

@@ -55,11 +55,12 @@ function default_settings() {
 function update_script() {
 header_info
 if [[ ! -d /etc/pihole ]]; then msg_error "No ${APP} Installation Found!"; exit; fi
-msg_info "Updating ${APP} LXC"
-apt-get update &>/dev/null
-apt-get -y upgrade &>/dev/null
-msg_ok "Updated Successfully"
+msg_info "Updating ${APP}"
+set +e
+pihole -up
+msg_ok "Updated ${APP}"
 exit
+fi
 }
 
 start