window: open directories in the grid view (3u0) and stop late load forcing large

ggaze_window_open always set the stack to "large" and loaded the first
image even for a directory argument, contradicting the documented
folder-to-grid behavior. A directory arg now shows the populated
thumbnail grid; a file arg still opens large on that image.

_show_texture additionally forced the stack to "large" whenever an image
finished loading, which yanked a just-opened folder back out of the grid
the moment its first image decoded. Drop the forced stack switch — the
caller already sets the right view (file-open/toggle/grid-activate set
large; directory-open sets grid), so _show_texture only needs to update
the viewer's texture.

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