sensors: don't pass excess conn handler

We don't need to pass connection handler to setInitialProperties method
since it already part of the sensor class.

Tested: no changes in behaviour.
Signed-off-by: Andrei Kartashev <a.kartashev@yadro.com>
Change-Id: Icaaccbeaf14e22648a6a1bce381f0f0a606b0ddd
diff --git a/src/CPUSensor.cpp b/src/CPUSensor.cpp
index 078d790..6154b6f 100644
--- a/src/CPUSensor.cpp
+++ b/src/CPUSensor.cpp
@@ -84,7 +84,7 @@
             association = objectServer.add_interface(interfacePath,
                                                      association::interface);
 
-            setInitialProperties(conn, units);
+            setInitialProperties(units);
         }
     }