evas: remove duplicate function call in evas_shutdown().

Summary:
evas_font_dir_cache_free() is called twice in evas_shutdown().
evas_common_shutdown() will call evas_font_dir_cache_free().

Test Plan: NONE

Reviewers: tasn, woohyun

Subscribers: herdsman, cedric

Differential Revision: https://phab.enlightenment.org/D1417

src/lib/evas/canvas/evas_main.c

@@ -122,7 +122,6 @@ evas_shutdown(void)
    evas_thread_shutdown();
    _evas_preload_thread_shutdown();
    evas_async_events_shutdown();
-   evas_font_dir_cache_free();
    evas_common_shutdown();
    evas_module_shutdown();