Remove unused variable 'path' in handleDbusSignalPropChange

The variable `path` was assigned using `msg.get_path()` but never used
in the logic. This patch removes the redundant line to clean up the
code and avoid unused variable warnings.

Change-Id: I4c1eee8e3688b5483509670b79ef515b7892d86e
Signed-off-by: George Liu <liuxiwei@ieisystem.com>
diff --git a/dbusSensor.cpp b/dbusSensor.cpp
index 527a848..0d9733e 100644
--- a/dbusSensor.cpp
+++ b/dbusSensor.cpp
@@ -109,8 +109,6 @@
             msg.unpack<std::string,
                        std::map<std::string, SensorValuePropertiesVariant>>();
 
-        std::string path = msg.get_path();
-
         if (auto itr = msgData.find("Value"); itr != msgData.end())
         {
             value = std::get<double>(itr->second);