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/test/TestManager.cpp b/test/TestManager.cpp
index b1cf4ec..db36b42 100644
--- a/test/TestManager.cpp
+++ b/test/TestManager.cpp
@@ -20,8 +20,7 @@
     Manager manager;
 
     TestManager() : bus(sdbusplus::bus::new_default()), manager(bus)
-    {
-    }
+    {}
 
     // Proxies for Manager's private members and functions
     Mode getTimeMode()