use quotes for local headers

Signed-off-by: Patrick Venture <venture@google.com>
Change-Id: I95f247bd17cffab8b9ef3337f48336f8d7059c2d
diff --git a/include/sensor.hpp b/include/sensor.hpp
index 21474b1..aad8548 100644
--- a/include/sensor.hpp
+++ b/include/sensor.hpp
@@ -1,6 +1,7 @@
 #pragma once
 
-#include <Thresholds.hpp>
+#include "Thresholds.hpp"
+
 #include <sdbusplus/asio/object_server.hpp>
 
 constexpr size_t sensorFailedPollTimeMs = 5000;