android: Fix port scanning IMC

Since 9e88bb987d ("Subscribed Scanner IMC/IMV to IETF_FIREWALL PA subtype")
the port filter attribute is requested with a different message type.

src/frontends/android/app/src/main/jni/libandroidbridge/byod/imc_android.c

@@ -53,7 +53,7 @@ static const char imc_name[] = "Android";
 
 static pen_type_t msg_types[] = {
 	{ PEN_IETF, PA_SUBTYPE_IETF_OPERATING_SYSTEM },
-	{ PEN_IETF, PA_SUBTYPE_IETF_VPN },
+	{ PEN_IETF, PA_SUBTYPE_IETF_FIREWALL },
 	{ PEN_TCG, PA_SUBTYPE_TCG_PTS },
 };