ep-engine configuration.json "dynamic" flag is backwards

genconfig.cc uses the "dynamic" attribute of objects in configuration.json to determine if setters should be generated - logically true would indicate that something is not read only; this is not the case.

static bool isReadOnly(cJSON *o) {

    cJSON *i = cJSON_GetObjectItem(o, "dynamic");

    if (i == NULL || i->type == cJSON_False) {

        return false;

    }

    cb_assert(i->type == cJSON_True);

    return true;

}

In reality, "dynamic": false or a missing dynamic flag is used to indicate that something is not read only. "dynamic":true is never used, but would mark the parameter as read only, and setters would not be generated.