fixup! feat(webcal): only update modified and deleted events from web…

…cal calendars

apps/dav/lib/CalDAV/WebcalCaching/RefreshWebcalService.php

@@ -250,6 +250,6 @@ private function compareWithoutDtstamp(Component $vObject, array $calendarObject
 			unset($component->{'DTSTAMP'});
 		}
 
-		return md5($localVobject->serialize()) === md5($vObject->serialize());
+		return strcasecmp($localVobject->serialize(), $vObject->serialize()) === 0;
 	}
 }