Fix renewal of ECC/ECDSA certificates.

The ACME v2 implementation uses separate directoies for ECC and on-ECC
certificates. The renew command for a domain checks if an ECC directory
exists (having a "_ecc" suffix) and refuses the command unless the
"--ecc" flag was specified.

Confusingly, this flag is only required to *renew* an ECC certificate,
but not to issue it.

This fixes https://github.com/Froxlor/Froxlor/issues/820.

lib/Froxlor/Cron/Http/LetsEncrypt/AcmeSh.php

@@ -327,6 +327,9 @@ class AcmeSh extends \Froxlor\Cron\FroxlorCron
 			}
 			if (Settings::Get('system.leecc') > 0) {
 				$acmesh_cmd .= " --keylength ec-" . Settings::Get('system.leecc');
+				if ($cert_mode != 'issue') {
+					$acmesh_cmd .= " --ecc";
+				}
 			} else {
 				$acmesh_cmd .= " --keylength " . Settings::Get('system.letsencryptkeysize');
 			}