evas: evas_cache: copied images should be considered loaded.
This is a backport of 81409.
Whenever we copy an image, making it write-able (evas_object_image_data_get(o, 1)) or just start painting a pristine buffer (evas_object_image_size_set(o, w, h)), we must mark the image as loaded to avoid trying to load it (and failing, marking the whole thing as EVAS_LOAD_ERROR_GENERIC).
