evas: free font lists correctly

sometimes a canvas object is zombying, and does not get freed correctly.
If this is right now happening in our test suite, we are going to free
the list, but do not clean up the pointer in there.

Reviewed-by: Mike Blumenkrantz <michael.blumenkrantz@gmail.com>
Differential Revision: https://phab.enlightenment.org/D11594

src/lib/evas/canvas/evas_main.c

@@ -240,6 +240,8 @@ evas_shutdown(void)
 
    evas_focus_shutdown();
 
+   evas_fonts_zero_free();
+
    evas_cache_vg_shutdown();
 
    evas_font_path_global_clear();