Fixed potential issue caused by network-manager.

When using multiple interfaces, the network manager was causing problems.
Specifically, when attempting to use different master & monitor interfaces.

attacks/Captive Portal/attack.sh

@@ -1295,6 +1295,11 @@ stop_attack() {
 
   captive_portal_stop_interface
 
+  # Start the network-manager if it's disabled.
+  if ! systemctl status network-manager.service &> /dev/null; then
+    systemctl start network-manager.service
+  fi
+
   CaptivePortalState="Stopped"
 }
 
@@ -1305,6 +1310,11 @@ start_attack() {
 
   stop_attack
 
+  # Disable the network-manager if it's available.
+  if systemctl status network-manager.service &> /dev/null; then
+    systemctl stop network-manager.service
+  fi
+
   captive_portal_start_interface
 
   echo -e "$FLUXIONVLine $CaptivePortalStartingDHCPServiceNotice"