Update repeater flood advert interval to 47 hours

examples/simple_repeater/MyMesh.cpp

@@ -884,7 +884,7 @@ MyMesh::MyMesh(mesh::MainBoard &board, mesh::Radio &radio, mesh::MillisecondCloc
   _prefs.cr = LORA_CR;
   _prefs.tx_power_dbm = LORA_TX_POWER;
   _prefs.advert_interval = 1;        // default to 2 minutes for NEW installs
-  _prefs.flood_advert_interval = 12; // 12 hours
+  _prefs.flood_advert_interval = 47; // 47 hours
   _prefs.flood_max = 64;
   _prefs.interference_threshold = 0; // disabled