Plugin: OnlyOffice: Avoid static call to non-static method AppConfig::GetLinkToDocs()

plugin/onlyoffice/lib/onlyofficeSettingsFormBuilder.php

@@ -99,8 +99,9 @@ class OnlyofficeSettingsFormBuilder {
             $message,
             'info'
         );
+        $appConfig = new AppConfig();
         $bannerTemplate = self::buildTemplate('get_docs_cloud_banner', [
-            'docs_cloud_link' => AppConfig::GetLinkToDocs(),
+            'docs_cloud_link' => $appConfig->GetLinkToDocs(),
             'banner_title' => $plugin->get_lang('DocsCloudBannerTitle'),
             'banner_main_text' => $plugin->get_lang('DocsCloudBannerMain'),
             'banner_button_text' => $plugin->get_lang('DocsCloudBannerButton'),