Fix capitalization

Signed-off-by: Thomas Schneider <thomas@fsmpi.rwth-aachen.de>

request-tracker/templates/RT_SiteConfig.pm.j2

@@ -96,5 +96,5 @@ Set($SetOutgoingMailFrom, '{{rt_bounceaddress}}');
 
 ### Logo
 Set($LogoAltText, '{{rt_logotext}}');
-Set($LogoLinkUrl, '{{rt_logolinkurl}}');
-#Set($LogoUrl, it’s easier to upload this in the web interface);
+Set($LogoLinkURL, '{{rt_logolinkurl}}');
+#Set($LogoURL, it’s easier to upload this in the web interface);