Refactored LogsPopup. (#838)

* Replaced 3rd party getting channel ID with own implementation.

* Removed useless roomID_ from LogsPopup.

* Refactored channelName_ in LogsPopup.

* Cleaned up LogsPopup.

* Removed getRoomID() method in LogsPopup.

src/widgets/dialogs/LogsPopup.hpp

@@ -25,13 +25,12 @@ private:
     ChannelPtr channel_;
 
     QString userName_;
-    int roomID_;
+    QString channelName_;
 
     void initLayout();
     void setMessages(std::vector<MessagePtr> &messages);
-    void getRoomID();
     void getOverrustleLogs();
-    void getLogviewerLogs();
+    void getLogviewerLogs(const QString &roomID);
 };
 
 }  // namespace chatterino