esp32: fix a bug caused by signal test code

Fix a WiFi bug caused by signal test code.

diff --git a/components/esp32/lib b/components/esp32/lib
index 228d9f195df07fe01dc1f060497a9a209b500d16..84f45bea0dfbec6cb1cea9ddd781b8d8fc827fd1 160000 (submodule)
--- a/components/esp32/lib
+++ b/components/esp32/lib
@@ -1 +1 @@
-Subproject commit 228d9f195df07fe01dc1f060497a9a209b500d16
+Subproject commit 84f45bea0dfbec6cb1cea9ddd781b8d8fc827fd1