Fixes silverstripe#139 - Broken URL Segment CMS Links

Fixes issue silverstripe#139 using normann's solution that seems to work perfectly with both long and short links.

code/extensions/SiteTreeSubsites.php

@@ -99,10 +99,8 @@ function updateCMSFields(FieldList $fields) {
 				($nested_urls_enabled && $this->owner->ParentID ? $this->owner->Parent()->RelativeLink(true) : null)
 			);
 
-			$url = (strlen($baseLink) > 36 ? "..." .substr($baseLink, -32) : $baseLink);
-
 			$urlsegment = $fields->dataFieldByName('URLSegment');
-			$urlsegment->setURLPrefix($url);
+			$urlsegment->setURLPrefix($baseLink);
 		}
 	}