avoid using projRequire in NodeBB

avoid

var path = require('path');
require.main._req = require.main.require;

require.main.require = function(mod) {
    if ((mod.startsWith('./') || mod.startsWith('/'))) {
        var fullPath = path.join(__dirname,'\\',mod);
        return require.main._req(fullPath);
    }
    return require.main._req(mod);
}