gluon-node-info: remove obsolete migration/fixup

package/gluon-node-info/luasrc/lib/gluon/upgrade/520-node-info-whitespace-fix

-#!/usr/bin/lua
-local uci = require('simple-uci').cursor()
-local util = require 'gluon.util'
-
-local sname = uci:get_first('gluon-node-info', 'location')
-if sname then
-  local options = {'longitude', 'latitude', 'altitude'}
-  for _, option in ipairs(options) do
-    local value = uci:get('gluon-node-info', sname, option)
-    if value then
-      uci:set('gluon-node-info', sname, option, util.trim(value))
-    end
-  end
-  uci:save('gluon-node-info')
-end