Avoid deprecated rsvg_handle_close()
- rsvg_handle_close() is deprecated from librsvg 2.46
- rsvg_handle_close() isn't needed to be called after rsvg_handle_new_from_file() [1]
1: https://gnome.pages.gitlab.gnome.org/librsvg/Rsvg-2.0/method.Handle.close.html