Revert "pixma: MP490 Series doesn't need special image formatting @ high dpi"

This reverts commit 1675697366.

See issue sane-project/backends#338

backend/pixma/pixma_mp150.c

@@ -1150,7 +1150,6 @@ post_process_image_data (pixma_t * s, pixma_imagebuf_t * ib)
            * MP220, MX360 and generation 5 scanners are exceptions */
           if (n > 1
               && s->cfg->pid != MP220_PID
-              && s->cfg->pid != MP490_PID
               && s->cfg->pid != MX360_PID
               && (mp->generation < 5
                   /* generation 5 scanners *with* special image format */