Check for updates dialog now always on top.

The check for downloads dialogs were started asynchonously. This was the reason for the dialog ending up under other windows and behaving strangely since other windows will steal focus as soon as the dialog lets go of it.

companion/src/mainwindow.cpp

@@ -222,7 +222,7 @@ void MainWindow::checkForUpdates(bool ignoreSettings, QString & fwId)
 
     if(ignoreSettings) {
       downloadDialog_forWait = new downloadDialog(this, tr("Checking for updates"));
-      downloadDialog_forWait->show();
+      downloadDialog_forWait->exec();
     } else {
       downloadDialog_forWait = NULL; // TODO needed?
     }
@@ -272,7 +272,7 @@ void MainWindow::checkForUpdateFinished(QNetworkReply * reply)
             downloadDialog * dd = new downloadDialog(this, QString(OPENTX_COMPANION_DOWNLOADS C9X_INSTALLER).arg(version), fileName);
             installer_fileName = fileName;
             connect(dd, SIGNAL(accepted()), this, SLOT(updateDownloaded()));
-            dd->show();
+            dd->exec();
           }
         }
 #else