Fix the error that tl-wdr3320-v2 can't upgrade firmware via web
interface by using magic_ver="0200" for this device.
Signed-off-by: 南浦月 <nanpuyue@gmail.com>
[commit message facelift]
Signed-off-by: Adrian Schmutzler <freifunk@adrianschmutzler.de>
(cherry picked from commit 0ff2385a92c0a31769fce954b7bd571d6114dbc8)