fix(acme): fixed deployment not taking _ecc into account

refs acmesh-official/acme.sh#4552

- there was a change in the acme.sh script which changed the default
  certificate type
- unfortunately this has led to breaking the SSL creation process
  because the wrong path is used
- from the referenced issue, this is a workaround that fixes the problem
  for now

extensions/nginx/acme.js

@@ -64,7 +64,8 @@ async function generateCert(ui, domain, webroot, email, staging) {
         `--domain ${domain}`,
         `--webroot ${webroot}`,
         `--reloadcmd "${nginxProgramName} -s reload"`,
-        `--accountemail ${email}`
+        `--accountemail ${email}`,
+        '--keylength 2048'
     ];
 
     if (staging) {