Fix log message for integer property validation

Update error log message to clarify that the expected variant type is
an integer for Integer properties.

Change-Id: Ie9c5aa53755d146d6c7543397e13396f745bc72e
Signed-off-by: Manojkiran Eda <manojkiran.eda@gmail.com>
diff --git a/src/manager.cpp b/src/manager.cpp
index 9581e15..5dbd4dc 100644
--- a/src/manager.cpp
+++ b/src/manager.cpp
@@ -277,7 +277,7 @@
             // For enumeration the expected variant types is Integer
             if (std::get<1>(pair.second).index() == 1)
             {
-                lg2::error("Enumeration property value is not int");
+                lg2::error("Integer property value is not int");
                 throw InvalidArgument();
             }