uboot-envtools: change size for unifi-6-lr

The previous commit increased the U-Boot environment size of the
UniFi 6 LR to 0x4000. Also change it uboot-envtools accordingly.

Signed-off-by: Daniel Golle <[email protected]>

package/boot/uboot-envtools/files/mediatek

@@ -36,7 +36,7 @@ buffalo,wsr-2533dhp2)
 	ubootenv_add_uci_config "/dev/mtd3" "0x0" "0x1000" "0x20000"
 	;;
 ubnt,unifi-6-lr-ubootmod)
-	ubootenv_add_uci_config "/dev/mtd2" "0x0" "0x1000" "0x10000"
+	ubootenv_add_uci_config "/dev/mtd2" "0x0" "0x4000" "0x10000"
 	;;
 esac