Fix victorops recovery alerts (#9651)

* send entity ID as string

VO will not accept an int as an entity ID, this causes issues when issuing recovery alerts as the entity_id is the only way to link incidents.  I have tested this with VO and incidents will alert AND recover.

* change from str() to strval() which is the correct function

LibreNMS/Alert/Transport/Victorops.php

@@ -41,7 +41,7 @@ class Victorops extends Transport
         $url = $opts['url'];
 
         $protocol = array(
-            'entity_id' => ($obj['id'] ? $obj['id'] : $obj['uid']),
+            'entity_id' => strval($obj['id'] ? $obj['id'] : $obj['uid']),
             'state_start_time' => strtotime($obj['timestamp']),
             'entity_display_name' => $obj['title'],
             'state_message' => $obj['msg'],