remove default server from certificate object

Author: mnr73

backend/schema/components/certificate-object.json

@@ -46,10 +46,6 @@
 			"enum": ["ecdsa", "rsa"],
 			"description": "Type of SSL key (either ecdsa or rsa)"
 		},
-		"default_server": {
-			"type": "boolean",
-			"description": "Defines if the server is the default for unmatched requests"
-		},
 		"meta": {
 			"type": "object",
 			"additionalProperties": false,