Fixes upgrade issues in configuration.

ldap_sso.install

@@ -90,3 +90,13 @@ function ldap_sso_update_8006() {
   $config->save(TRUE);
 }
 
+/**
+ * Fix remaining non-boolean configuration fields.
+ */
+function ldap_sso_update_8007() {
+  $config_factory = \Drupal::configFactory();
+  $config = $config_factory->getEditable('ldap_sso.settings');
+  $config->set('seamlessLogin', (bool) $config->get('seamlessLogin'));
+  $config->set('ssoRemoteUserStripDomainName', (bool) $config->get('ssoRemoteUserStripDomainName'));
+  $config->save(TRUE);
+}