optimize calendar search query

see nextcloud/calendar#4758

Signed-off-by: Jamie McClelland <[email protected]>

apps/dav/lib/CalDAV/CalDavBackend.php

@@ -1839,7 +1839,7 @@ public function search(array $calendarInfo, $pattern, array $searchProperties,
 
 		// only return public items for shared calendars for now
 		if (isset($calendarInfo['{http://owncloud.org/ns}owner-principal']) === false || $calendarInfo['principaluri'] !== $calendarInfo['{http://owncloud.org/ns}owner-principal']) {
-			$innerQuery->andWhere($innerQuery->expr()->eq('c.classification',
+			$outerQuery->andWhere($outerQuery->expr()->eq('c.classification',
 				$outerQuery->createNamedParameter(self::CLASSIFICATION_PUBLIC)));
 		}