Fix 'RemoveDefGwOnDhcpForLocalhost' function: Change to exclude unplugged device from MAC address list.

src/Mayaqua/Microsoft.c

@@ -2568,6 +2568,7 @@ MS_ADAPTER_LIST *MsCreateAdapterListInnerExVista(bool no_info)
 				UniStrCpy(a->TitleW, sizeof(a->TitleW), title);
 				UniToStr(a->Title, sizeof(a->Title), title);
 				a->Index = r->InterfaceIndex;
+				a->MediaConnectState = r->MediaConnectState;
 				a->Type = r->Type;
 				a->Status = ConvertMidStatusVistaToXp(r->OperStatus);
 				a->Mtu = r->Mtu;

src/Mayaqua/Microsoft.h

@@ -281,6 +281,7 @@ typedef struct MS_ADAPTER
 	char Title[MAX_PATH];			// Display name
 	wchar_t TitleW[MAX_PATH];		// Display Name (Unicode)
 	UINT Index;						// Index
+	UINT MediaConnectState;			// Media Connect State
 	UINT Type;						// Type
 	UINT Status;					// Status
 	UINT Mtu;						// MTU

src/Mayaqua/Network.c

@@ -540,6 +540,13 @@ LIST *Win32GetNicList()
 
 		if (a->Type == 6 && a->AddressSize == 6)
 		{
+			// If the connection state of the interface is unknown, then exclude it.
+			// Unknown means that the device is not plugged into the local host.
+			if (a->MediaConnectState == MediaConnectStateUnknown)
+			{
+				continue;
+			}
+
 			NIC_ENTRY *e = ZeroMalloc(sizeof(NIC_ENTRY));
 
 			StrCpy(e->IfName, sizeof(e->IfName), a->Title);