image_info: Display disabled WP pin as disabled

The image formats know about the special value 0xee used to disable WP.
Display this with image_info.

E.g.:

ESP32-C3 extended image header
==============================
WP pin: disabled

esptool/cmds.py

@@ -737,7 +737,7 @@ def get_key_from_value(dict, val):
             title = "{} extended image header".format(args.chip.upper())
             print(title)
             print("=" * len(title))
-            print("WP pin: {:#02x}".format(image.wp_pin))
+            print("WP pin:", "disabled" if image.wp_pin == image.WP_PIN_DISABLED else f"{image.wp_pin:#02x}")
             print(
                 "Flash pins drive settings: "
                 "clk_drv: {:#02x}, q_drv: {:#02x}, d_drv: {:#02x}, "