samples: Bluetooth: Increase timeout for broadcast audio source

Increase the time between resets from 30s to 120s.
This make it easier to properly use, while still get
the chance to test the stop functionality.

Signed-off-by: Emil Gydesen <emil.gydesen@nordicsemi.no>
diff --git a/samples/bluetooth/broadcast_audio_source/src/main.c b/samples/bluetooth/broadcast_audio_source/src/main.c
index e57ceef..76448b4 100644
--- a/samples/bluetooth/broadcast_audio_source/src/main.c
+++ b/samples/bluetooth/broadcast_audio_source/src/main.c
@@ -33,7 +33,7 @@
 static K_SEM_DEFINE(sem_started, 0U, ARRAY_SIZE(streams));
 static K_SEM_DEFINE(sem_stopped, 0U, ARRAY_SIZE(streams));
 
-#define BROADCAST_SOURCE_LIFETIME  30U /* seconds */
+#define BROADCAST_SOURCE_LIFETIME  120U /* seconds */
 
 static void stream_started_cb(struct bt_audio_stream *stream)
 {