demos: zip_container: Use clipped blit.
demos: zip_container: Use clipped blit.

Otherwise the example fails on assert() in GP_Blit.c when image is
larger than screen window.

Signed-off-by: Cyril Hrubis <b1e90efd3b808b8e0bcf2a9a55fd8b9a779bfd81@ucw.cz>

gfxprim/gfxprim,gfxprim/gfxprim,gfxprim/gfxprim,gfxprim/gfxprim,gfxprim/gfxprim