display_options: Drop two spaces before the ASCII column

At present with print_buffer() U-Boot shows four spaces between the hex
and ASCII data. Two seems enough and matches print_hex_dump(). Change it.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/test/ut.c b/test/ut.c
index 350509a..1eec2a5 100644
--- a/test/ut.c
+++ b/test/ut.c
@@ -151,7 +151,7 @@
 		if (str[8] != ':' || str[9] != ' ')
 			return 1;
 
-		bytes = len - 8 - 2 - 3 * 16 - 4;
+		bytes = len - 8 - 2 - 3 * 16 - 2;
 		upto += bytes;
 	}