Fix FTF code, I don't know what changed, was cache_id really reported as string before?

okapi.cpp

@@ -359,7 +359,7 @@ void Okapi::get_ftf(uint uid, Caches& cc) const {
 	json j = json::parse(curl_output);
 	for (auto& el : j.items()) {
 		if (el.value().is_null()) continue;
-		uint id = std::stoi(el.value()["cache_id"].get<std::string>());
+		uint id = el.value()["cache_id"];
 		auto c = std::find_if(cc.begin(), cc.end(), [&](const auto& a) { return a.internal_id == id; });
 		if (c != std::end(cc))
 			c->ftf = 1;