generate thumbnail based on rotated image according to EXIF orientation tag

Summary:
jpeg image which has EXIF orientation meta data was not rotated properly in fm or preview.

@fix

Test Plan:
1. get in "efl/src/tests/evas/images/ in fm.
2. check whether Light_exif_*.jpg are properly rotated or not.

Reviewers: raster, zmike

CC: seoz, cedric

Differential Revision: https://phab.enlightenment.org/D1109

src/bin/e_thumb_main.c

@@ -420,6 +420,7 @@ _e_thumb_generate(E_Thumb *eth)
         else if (evas_object_image_extension_can_load_get(ext))
           {
              im = evas_object_image_add(evas);
+             evas_object_image_load_orientation_set(im, EINA_TRUE);
              evas_object_image_load_size_set(im, eth->w, eth->h);
              evas_object_image_file_set(im, eth->file, NULL);
              iw = 0; ih = 0;