[BUGFIX] Fix display of login message in EXT:felogin

The template now evaluates the correct variable for
checking whether the login message should be
displayed on the overview page.

Resolves: #92939
Releases: master, 10.4
Change-Id: I54dd4759b3154be5e57cc38df89a52e22c838f63
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/67049


Tested-by: TYPO3com <noreply@typo3.com>
Tested-by: Simon Gilli <typo3@gilbertsoft.org>
Tested-by: Benni Mack <benni@typo3.org>
Reviewed-by: Simon Gilli <typo3@gilbertsoft.org>
Reviewed-by: Benni Mack <benni@typo3.org>

typo3/sysext/felogin/Resources/Private/Templates/Login/Overview.html

@@ -4,12 +4,10 @@
     <f:render partial="CookieWarning"/>
 </f:if>
 
-<f:if condition="{loginMessage}">
-    <f:then>
-        <h3>
-            <f:render partial="RenderLabelOrMessage" arguments="{key: 'success_header'}"/>
-        </h3>
-    </f:then>
+<f:if condition="{showLoginMessage}">
+    <h3>
+        <f:render partial="RenderLabelOrMessage" arguments="{key: 'success_header'}"/>
+    </h3>
 </f:if>
 
 <f:translate key="login_user_info" arguments="{0: '{user.username}'}"/>