luci-mod-network: fix available wifi channels

rpcd iwinfo freqlist does not set a `no_ir` field.
It is instead a flag so check in the flags list instead.

Signed-off-by: Samuele Yang <samuele.yang@morsemicro.com>

modules/luci-mod-network/htdocs/luci-static/resources/view/network/wireless.js

@@ -349,7 +349,7 @@ var CBIWifiFrequencyValue = form.Value.extend({
 					return;
 
 				const band = '%dg'.format(freq.band);
-				const available = (freq.restricted && freq.no_ir) ? false: true;
+				const available = !(freq.restricted && freq.flags.includes("no_ir"));
 
 				this.channels[band].push(
 					freq.channel,