ffho-config-mode-geo-location: Delete Altitude if exists

ffho/ffho-config-mode-geo-location/files/lib/gluon/upgrade/999-delete-altitude.lua

+#!/usr/bin/lua
+
+local uci = require('luci.model.uci').cursor()
+
+local sname = uci:get_first("gluon-node-info", "location")
+local altitude = uci:get("gluon-node-info", sname, "altitude")
+if altitude ~= nil then
+  uci:delete("gluon-node-info", sname, "altitude")
+  uci:save("gluon-node-info")
+  uci:commit("gluon-node-info")
+end