apps: blestress: fix test 6

Disable filtering of advertising reports, as we check the same data N
times, and only first time is registered with filtering enabled.
diff --git a/apps/blestress/src/tx_stress.c b/apps/blestress/src/tx_stress.c
index 1711f9f..5d5f227 100644
--- a/apps/blestress/src/tx_stress.c
+++ b/apps/blestress/src/tx_stress.c
@@ -73,7 +73,7 @@
     params.passive = 1;
     params.window = BLE_GAP_SCAN_FAST_WINDOW;
 
-    rc = ble_gap_ext_disc(own_addr_type, duration, 0, 1, 0, 0, &params, NULL,
+    rc = ble_gap_ext_disc(own_addr_type, duration, 0, 0, 0, 0, &params, NULL,
                           cb, NULL);
 
     if (rc != 0) {