uboot-mediatek: fix malformed patch

The chunk length is not correct.

Fixes: d2fabb974c ("mediatek: add support for Wavlink WL-WNT100X3 ubootmod")
Signed-off-by: Shiji Yang <yangshiji66@outlook.com>
(cherry picked from commit de769c6d66)
Link: https://github.com/openwrt/openwrt/pull/25762
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>

package/boot/uboot-mediatek/patches/503-add-wavlink-wl-wnt100x3.patch

@@ -262,7 +262,7 @@
 +};
 --- /dev/null
 +++ b/defenvs/wavlink_wl-wnt100x3_env
-@@ -0,0 +1,53 @@
+@@ -0,0 +1,54 @@
 +ipaddr=192.168.1.1
 +serverip=192.168.1.254
 +loadaddr=0x46000000