Fix modifying default CA (#3708)

install.sh

@@ -147,7 +147,7 @@ setup_ssl_certificate() {
     echo -e "${green}Issuing SSL certificate for ${domain}...${plain}"
     echo -e "${yellow}Note: Port 80 must be open and accessible from the internet${plain}"
     
-    ~/.acme.sh/acme.sh --set-default-ca --server letsencrypt >/dev/null 2>&1
+    ~/.acme.sh/acme.sh --set-default-ca --server letsencrypt --force >/dev/null 2>&1
     ~/.acme.sh/acme.sh --issue -d ${domain} --listen-v6 --standalone --httpport 80 --force
     
     if [ $? -ne 0 ]; then