clang-format: update to latest from docs repo

Since `Cpp11` is an alias for `Latest` and we should tend towards using the
latest C++ standard, update the C++ standard to Latest.

https://github.com/llvm/llvm-project/commit/e5032567903de19962333c4bf7d2edceaf4f9824#diff-b49a097415dff2837d9626d422c58ba8R82
https://github.com/openbmc/docs/blob/master/style/cpp/.clang-format

Signed-off-by: George Liu <liuxiwei@inspur.com>
Change-Id: I6bd62f057c6881b4e931c1968d71ce5478832d73
diff --git a/property_change_listener.hpp b/property_change_listener.hpp
index d34fcf0..6439d3e 100644
--- a/property_change_listener.hpp
+++ b/property_change_listener.hpp
@@ -11,8 +11,7 @@
 {
   public:
     virtual ~PropertyChangeListner()
-    {
-    }
+    {}
 
     /** @brief Notified on time mode is changed */
     virtual void onModeChanged(Mode mode) = 0;