qcam: main_window: Fix combo-box entry selection on startup

When one of the camera is selected and opened from the
"Select Cameras" items list, the entry of the combo-box
in the main-window doesn't update its item index to reflect
the camera which was earlier selected. Fix that.

Signed-off-by: Umang Jain <email@uajain.com>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Tested-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

src/qcam/main_window.cpp

@@ -250,6 +250,9 @@ int MainWindow::openCamera()
 		return -EBUSY;
 	}
 
+	/* Set the combo-box entry with the currently selected Camera. */
+	cameraCombo_->setCurrentText(QString::fromStdString(cameraName));
+
 	return 0;
 }