Fix typo from the bridges array

manage-maas-nodes.sh

@@ -206,7 +206,7 @@ build_vms() {
         # such that this can be either bridge or network type
         if [[ $network_type == "bridge" ]] ; then
             net_prefix="bridge"
-            net_type=(${bridge[@]})
+            net_type=(${bridges[@]})
         elif [[ $network_type == "network" ]] ; then
             net_prefix="network"
             net_type=(${networks[@]})