3503934-fixed Route update.theme_install does not exist

Closes #3503934

admin_toolbar_tools/src/Plugin/Derivative/ExtraLinks.php

@@ -486,7 +486,7 @@ class ExtraLinks extends DeriverBase implements ContainerDeriverInterface {
 
     // If module Update Manager is enabled.
     if ($this->moduleHandler->moduleExists('update')) {
-      if (version_compare(\Drupal::VERSION, '11.0.0', '<')) {
+      if (version_compare(\Drupal::VERSION, '10.4.0', '<')) {
         $links['update.module_install'] = [
           'title' => $this->t('Install new module'),
           'route_name' => 'update.module_install',
@@ -498,7 +498,7 @@ class ExtraLinks extends DeriverBase implements ContainerDeriverInterface {
         'route_name' => 'update.module_update',
         'parent' => 'system.modules_list',
       ] + $base_plugin_definition;
-      if (version_compare(\Drupal::VERSION, '11.0.0', '<')) {
+      if (version_compare(\Drupal::VERSION, '10.4.0', '<')) {
         $links['update.theme_install'] = [
           'title' => $this->t('Install new theme'),
           'route_name' => 'update.theme_install',