Update put.json

Password can be left blank for updates.  Otherwise you have to reenter the password every time you save the auth list

backend/schema/paths/nginx/access-lists/listID/put.json

@@ -49,8 +49,7 @@
 										"minLength": 1
 									},
 									"password": {
-										"type": "string",
-										"minLength": 1
+										"type": "string"
 									}
 								}
 							}