gluon-web-wifi-config: default to enabled 5GHz mesh interfaces when disabling outdoor mode

When disabling outdoor mode, 5GHz mesh interfaces should be enabled by
default again (unless disabled in site.conf).

(cherry picked from commit d2052431dd)

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

@@ -1,5 +1,6 @@
 local iwinfo = require 'iwinfo'
 local uci = require("simple-uci").cursor()
+local site = require 'gluon.site'
 local wireless = require 'gluon.wireless'
 
 
@@ -155,6 +156,9 @@ if has_5ghz_radio() then
 
 	for _, mesh_vif in ipairs(mesh_vifs_5ghz) do
 		mesh_vif:depends(outdoor, false)
+		if outdoor.default then
+			mesh_vif.default = not site.wifi5.mesh.disabled(false)
+		end
 	end
 
 	function outdoor:write(data)