Revert "remove duplicate virbr0"

This reverts commit 7b57860252.

emhttp/plugins/dynamix.vm.manager/include/libvirt_helpers.php

@@ -1246,7 +1246,6 @@ class Array2XML {
 		global $lv,$libvirt_running;
 		$arrValidNetworks = [];
 		exec("ls --indicator-style=none /sys/class/net | grep -Po '^((vir)?br|bond|eth|wlan)[0-9]+(\.[0-9]+)?'",$arrBridges);
-		unset($arrBridges[array_search('virbr0', $arrBridges)]);
 		// add 'virbr0' as default first choice
 		array_unshift($arrBridges, 'virbr0');
 		// remove redundant references of bridge and bond interfaces