[][MAC80211][core][Remove wrong assignment on the variable "changed" when changing beacon]

[Description]
Remove wrong assignment on the variable "changed" when changing beacon

[Release-log]
N/A

Change-Id: I9a2088d7321fd4277753401bea3f86124f9a5473
Reviewed-on: https://gerrit.mediatek.inc/c/openwrt/feeds/mtk_openwrt_feeds/+/8031098
1 file changed