Efl.Canvas.Vg.Object: Fix backup size
Summary:
Make the size to be backed up and the size to be compared equal.
and minor fix
Test Plan: N/A
Reviewers: Hermet, herb, kimcinoo
Reviewed By: Hermet
Subscribers: cedric, reviewers, committers
Tags: efl
Differential Revision: https://phab.enlightenment.org/D11925