luci-base: js linting fixes / ES6 treatment

follow-up to 50a8d53

Fix loop variable collision in getWifiNetidBySid

Signed-off-by: Paul Donald <newtwen+github@gmail.com>

Author: systemcrash

modules/luci-base/htdocs/luci-static/resources/network.js

@@ -215,13 +215,13 @@ function getWifiNetidBySid(sid) {
 		if (typeof(radioname) == 'string') {
 			const sections = uci.sections('wireless', 'wifi-iface');
 			let n = 0;
-			for (let s of sections) {
-				if (s.device != s.device)
+			for (let sec of sections) {
+				if (sec.device != radioname)
 					continue;
 
 				n++;
 
-				if (s['.name'] != s['.name'])
+				if (sec['.name'] != s['.name'])
 					continue;
 
 				return [ '%s.network%d'.format(s.device, n), s.device ];