gluon-web-wifi-config, gluon-web-private-wifi: hide pages on devices without WLAN

Fixes: #2311

package/gluon-web-private-wifi/luasrc/lib/gluon/config-mode/controller/admin/privatewifi.lua

+local uci = require("simple-uci").cursor()
+local wireless = require 'gluon.wireless'
+
 package 'gluon-web-private-wifi'
 
-entry({"admin", "privatewifi"}, model("admin/privatewifi"), _("Private WLAN"), 30)
+if wireless.device_uses_wlan(uci) then
+	entry({"admin", "privatewifi"}, model("admin/privatewifi"), _("Private WLAN"), 30)
+end

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

+local uci = require("simple-uci").cursor()
+local wireless = require 'gluon.wireless'
+
 package 'gluon-web-wifi-config'
 
-entry({"admin", "wifi-config"}, model("admin/wifi-config"), _("WLAN"), 20)
+if wireless.device_uses_wlan(uci) then
+	entry({"admin", "wifi-config"}, model("admin/wifi-config"), _("WLAN"), 20)
+end