made caller/concurrent rules tighter

src/providers/twitch/PartialTwitchUser.cpp

@@ -31,11 +31,6 @@ void PartialTwitchUser::getId(std::function<void(QString)> successCallback,
 {
     assert(!this->username_.isEmpty());
 
-    if (caller == nullptr)
-    {
-        caller = QThread::currentThread();
-    }
-
     NetworkRequest("https://api.twitch.tv/kraken/users?login=" +
                    this->username_)
         .caller(caller)

src/providers/twitch/TwitchChannel.cpp

@@ -607,7 +607,6 @@ void TwitchChannel::loadRecentMessages()
     }
 
     NetworkRequest(Env::get().recentMessagesApiUrl.arg(this->getName()))
-        .caller(QThread::currentThread())
         .concurrent()
         .onSuccess([weak = weakOf<Channel>(this)](auto result) -> Outcome {
             auto shared = weak.lock();