Ask user to retry if netjob fails

Signed-off-by: Trial97 <alexandru.tripon97@gmail.com>

launcher/net/NetJob.h

@@ -68,6 +68,7 @@ class NetJob : public ConcurrentTask {
    public slots:
     // Qt can't handle auto at the start for some reason?
     bool abort() override;
+    void emitFailed(QString reason) override;
 
    protected:
     void updateState() override;