openwrt/xiaomi: fix WED package

Signed-off-by: Sefa Eyeoglu <[e-mail]>

openwrt/xiaomi.nix

···
     "-wpad-basic-mbedtls"
     "wpad-openssl"
     "luci"
-    "offloader"
+    "bridger" # See https://openwrt.org/inbox/toh/xiaomi/ax3000t#wireless_ethernet_dispatch_wed
   ];
 }