Fix displaying contact with ID divisible by 100 in sql addressbook (#1489121)

CHANGELOG

@@ -1,6 +1,7 @@
 CHANGELOG Roundcube Webmail
 ===========================
 
+- Fix displaying contact with ID divisible by 100 in sql addressbook (#1489121)
 - Fix browser warnings on PDF plugin detection (#1489118)
 - Fix fatal error when parsing UUencoded messages (#1489119)
 

program/steps/addressbook/func.inc

@@ -773,7 +773,7 @@ function rcmail_get_cids($filter = null)
             }
         }
         else {
-            if (substr($id, -($got_source+1)) == "-$source") {
+            if (substr($id, -($got_source+1)) === "-$source") {
                 $id = substr($id, 0, -($got_source+1));
             }
             $result[$source][] = $id;