component/bt : fix actvie scan cannot send scan_req in a certain case

diff --git a/components/bt/lib b/components/bt/lib
index 0b1315e44bac473475b7f900db73c4437bcc3c04..856881b2768204ce2bf3584724324dddc8378f11 160000 (submodule)
--- a/components/bt/lib
+++ b/components/bt/lib
@@ -1 +1 @@
-Subproject commit 0b1315e44bac473475b7f900db73c4437bcc3c04
+Subproject commit 856881b2768204ce2bf3584724324dddc8378f11