console: reset font color to white by default

Reset font color to white for new cells. This allows us to draw reversed
cells that are not occupied by any value. Otherwise, these cells would be
still black if reversed.

Signed-off-by: David Herrmann <dh.herrmann@googlemail.com>

src/console.c

@@ -164,6 +164,9 @@ static int init_cell(struct cell *cell)
 		return -EINVAL;
 
 	memset(cell, 0, sizeof(*cell));
+	cell->attr.fr = 255;
+	cell->attr.fg = 255;
+	cell->attr.fb = 255;
 	return 0;
 }