auth ui: fix value not defined in enumeration error

...when editing LDAP realm sync settings and only a single property is
empty and thus to be deleted (e.g. values.delete = "filter").

If `delete` is a simple string and not an array,
`Proxmox.Utils.delete_if_default` simply creates a comma-separated list,
(e.g. value.delete = "filter,sync-attributes").

When the properties from the other panel are evaluated and added to the
the `delete` property, comma-separated list format is not considered,
leading to a final value for `delete` that could look like this:
  value.delete = {
    "server2",
    "comment",
    "filter,sync-attributes"
  }

This commit fixes this by splitting `delete` in case it is a string.

Reported-by: Friedrich Weber <f.weber@proxmox.com>
Signed-off-by: Lukas Wagner <l.wagner@proxmox.com>

src/window/AuthEditLDAP.js

@@ -243,6 +243,11 @@ Ext.define('Proxmox.panel.LDAPSyncInputPanel', {
 	Proxmox.Utils.delete_if_default(values, 'sync-defaults-options');
 	Proxmox.Utils.delete_if_default(values, 'sync-attributes');
 
+	// Force values.delete to be an array
+	if (typeof values.delete === 'string') {
+	   values.delete = values.delete.split(',');
+	}
+
 	if (me.isCreate) {
 	    delete values.delete; // on create we cannot delete values
 	}