eo: provider find actually is just accepting Efl.Class, maybe an hystoric left over.

Reviewed-by: SangHyeon Jade Lee <sh10233.lee@samsung.com>
Reviewed-by: Marcel Hollerbach <marcel-hollerbach@t-online.de>
Differential Revision: https://phab.enlightenment.org/D7440

src/lib/eo/efl_object.eo

@@ -166,7 +166,7 @@ abstract Efl.Object
           If this is not done the class cannot be found up in the object tree.
         ]]
         params {
-          klass : const(Efl.Object); [[The class identifier to search for]]
+          klass : const(Efl.Class); [[The class identifier to search for]]
         }
         return : Efl.Object; [[Object from the provider list]]
       }