[][MAC80211][misc][Fix uci not set group cipher]

[Description]
Fix uci not set group cipher.
Prevent for not set pairwise and let script clean wpa_cipher.

[Release-log]
N/A

Change-Id: I03ada0f8fb8a996b52353d784c67ccb4da6e0437
Reviewed-on: https://gerrit.mediatek.inc/c/openwrt/feeds/mtk_openwrt_feeds/+/7765497
1 file changed