increase MAX_NEIGHBOURS from 8 to 50

variants/xiao_nrf52/platformio.ini

@@ -82,7 +82,7 @@ build_flags =
   -D ADVERT_LAT=0.0
   -D ADVERT_LON=0.0
   -D ADMIN_PASSWORD='"password"'
-  -D MAX_NEIGHBOURS=8
+  -D MAX_NEIGHBOURS=50
 ;  -D MESH_PACKET_LOGGING=1
 ;  -D MESH_DEBUG=1
 build_src_filter = ${Xiao_nrf52.build_src_filter}