Fix version notifications for themes

I forgot to apply the change in a2e43d2 to themes

application/view/omeka/site-admin/index/theme.phtml

@@ -4,7 +4,7 @@ use Omeka\Site\Theme\Manager;
 $translate = $this->plugin('translate');
 $escape = $this->plugin('escapeHtml');
 $this->htmlElement('body')->appendAttribute('class', 'sites theme');
-$this->headScript()->prependFile($this->assetUrl('vendor/semver/semver.min.js', 'Omeka'));
+$this->headScript()->prependFile($this->assetUrl('vendor/compare-versions/index.js', 'Omeka'));
 
 $fallbackThumbnailUrl = $this->assetUrl('img/theme.jpg', 'Omeka');
 ?>
@@ -88,7 +88,7 @@ $.get('https://omeka.org/add-ons/json/s_theme.json')
  var addon = $('.version-notification');
  var addonId = addon.data('addon-id');
  if (addonId in data) {
- if (semver.lt(addon.data('current-version'), data[addonId]['latest_version'])) {
+ if (compareVersions.compareVersions(addon.data('current-version'), data[addonId]['latest_version']) === -1) {
  addon.show();
  }
  }