red-parse-qxl: Copy correctly brush position

This issue caused the glitches using the rectangular selection
tool in PaintShop 6.

The line was removed accidentally by "red_parse_qxl: fix throwing
away drawables that have masks" (812b65984d)

Signed-off-by: Frediano Ziglio <fziglio@redhat.com>
Acked-by: Pavel Grunt <pavelgrunt@gmail.com>
Acked-by: Uri Lublin <uril@redhat.com>

server/red_parse_qxl.c

@@ -596,6 +596,7 @@ static void red_get_brush_ptr(RedMemSlotInfo *slots, int group_id,
         break;
     case SPICE_BRUSH_TYPE_PATTERN:
         red->u.pattern.pat = red_get_image(slots, group_id, qxl->u.pattern.pat, flags, FALSE);
+        red_get_point_ptr(&red->u.pattern.pos, &qxl->u.pattern.pos);
         break;
     }
 }