gluon-web-wifi-config: fix incorrect UCI call

Fixes #1809

Fixes: bf552491 ("gluon-core: add outdoor support for 5 ghz radios")

package/gluon-web-wifi-config/luasrc/lib/gluon/config-mode/model/admin/wifi-config.lua

@@ -136,7 +136,7 @@ if has_5ghz_radio() then
 
 		local ht = r:option(ListValue, 'outdoor_htmode', translate('HT Mode') .. ' (' .. radio .. ')')
 		ht:depends(outdoor, true)
-		ht.default = uci.get('gluon', 'wireless', 'outdoor_' .. radio .. '_htmode') or 'default'
+		ht.default = uci:get('gluon', 'wireless', 'outdoor_' .. radio .. '_htmode') or 'default'
 
 		ht:value('default', translate("(default)"))
 		for mode, available in pairs(iwinfo.nl80211.htmodelist(phy)) do