firmware: regenerate php.ini after an upgrade

PHP plugins may change and then clobber the custom php.ini we have
previously generated.  To make sure everything keeps running smoothly,
always regerate it directly after an upgrade, even though there may
have been no changes.

src/opnsense/scripts/pkg_upgrade.sh

@@ -52,6 +52,8 @@ if [ -z "$pkg_running" ]; then
 		/usr/local/opnsense/scripts/pkg_updatecheck.sh
 		echo '***DONE***' >> /tmp/pkg_upgrade.progress
 	fi
+	# regenerate php.ini after upgrade to avoid spurious output
+	/usr/local/etc/rc.php_ini_setup
 else
 	echo 'Upgrade already in progress' >> /tmp/pkg_upgrade.progress
 	echo '***DONE***' >> /tmp/pkg_upgrade.progress