fix: remove -- from nmcli calls in moonarch-vpn

nmcli 1.56 treats -- as a connection name instead of end-of-options,
causing "Unknown connection --" errors when toggling VPN connections.

defaults/bin/moonarch-vpn

@@ -41,7 +41,7 @@ function connect_vpn() {
     local connection="$1"
     local feedback
 
-    if feedback=$(nmcli connection up -- "$connection" 2>&1); then
+    if feedback=$(nmcli connection up "$connection" 2>&1); then
         notify-send "VPN" "Connected to '$connection'"
     else
         notify-send -u critical "VPN" "Connection failed: $feedback"
@@ -53,7 +53,7 @@ function disconnect_vpn() {
     local connection="$1"
     local feedback
 
-    if feedback=$(nmcli connection down -- "$connection" 2>&1); then
+    if feedback=$(nmcli connection down "$connection" 2>&1); then
         notify-send "VPN" "Disconnected from '$connection'"
     else
         notify-send -u critical "VPN" "Disconnect failed: $feedback"