[BUGFIX] Call `f:count()` in Site Settings overview correctly

Resolves: #104939
Related: #104913
Releases: main
Change-Id: Ie3486041db6ffe31c10da32c5e281cbb6b2d0017
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/86048


Reviewed-by: Stefan Bürk <stefan@buerk.tech>
Tested-by: Garvin Hicking <gh@faktor-e.de>
Tested-by: Stefan Bürk <stefan@buerk.tech>
Reviewed-by: Garvin Hicking <gh@faktor-e.de>
Tested-by: core-ci <typo3@b13.com>
Reviewed-by: Benjamin Franzke <ben@bnf.dev>
Tested-by: Benjamin Franzke <ben@bnf.dev>

typo3/sysext/backend/Resources/Private/Templates/SiteSettings/Overview.html

@@ -4,7 +4,7 @@
 
     <h1><f:translate key="LLL:EXT:backend/Resources/Private/Language/locallang_sitesettings.xlf:overview.title"/></h1>
 
-    <f:if condition="{sites->f:count} == 0">
+    <f:if condition="{sites->f:count()} == 0">
         <f:be.infobox
             title="{f:translate(key:'LLL:EXT:backend/Resources/Private/Language/locallang_sitesettings.xlf:overview.noSiteSettingsExists.title')}"
             message="{f:translate(key:'LLL:EXT:backend/Resources/Private/Language/locallang_sitesettings.xlf:overview.noSiteSettingsExists.message')}"