Validates the settings form for an editor.
The contents of the editor settings are located in $form_state['values']['editor']['settings']. Calls to form_error() should reflect this location in the settings form.
array $form: An associative array containing the structure of the form.
array $form_state: A reference to a keyed array containing the current state of the form.
function settingsFormValidate(array $form, array &$form_state);