Allow PHP version check to execute on older version of PHP

Gerrit change 522014 (merged as b8b2514) mostly corrected this
issue, but one line was missed. Fixing that now.

Bug: T213893
Change-Id: I0a57f5902f1af2619fe47f7ee53695d3fd03adaf

diff --git a/maintenance/update.php b/maintenance/update.php
index 73edda9..6edca6e 100755 (executable)
--- a/maintenance/update.php
+++ b/maintenance/update.php
@@ -267,7 +267,7 @@ class UpdateMediaWiki extends Maintenance {
                                isset( $param['require'] ) ? $param['require'] : false,
                                isset( $param['withArg'] ) ? $param['withArg'] : false,
                                isset( $param['shortName'] ) ? $param['shortName'] : false,
-                               $param['multiOccurrence'] ?? false
+                               isset( $param['multiOccurrence'] ) ? $param['multiOccurrence'] : false
                        );
                }