lists: fix model detection

Upstream changed names of variables in /etc/os-release to correspond to
correct project name. It is no longer Lede but once again OpenWRT.

lists/utils.m4

@@ -43,7 +43,7 @@ function list_script(list)
 end
 
 if not board then
-	local model = model or os_release["LEDE_DEVICE_PRODUCT"]
+	local model = model or os_release["OPENWRT_DEVICE_PRODUCT"] or os_release["LEDE_DEVICE_PRODUCT"]
 	if model:match("[Mm]ox") then
 		board = "mox"
 	elseif model:match("[Oo]mnia") then