Fix-mirror-crash-under-wayland (#6644)

* Use format() instead of cMainOpenGLContext->format() or requestedFormat() when creating context that will be shared.

* Create rendering device window with the same format as used by the main OpenGLContext so that they are compatible.

src/webots/gui/WbRenderingDeviceWindow.cpp

@@ -112,9 +112,8 @@ WbRenderingDeviceWindow::WbRenderingDeviceWindow(WbRenderingDevice *device) :
   mUpdateRequested(true),
   mShowOverlayOnClose(true) {
   setSurfaceType(QWindow::OpenGLSurface);
-  QSurfaceFormat surfaceFormat = format();
-  surfaceFormat.setMajorVersion(3);
-  surfaceFormat.setMinorVersion(3);
+  assert(cMainOpenGLContext);
+  QSurfaceFormat surfaceFormat = cMainOpenGLContext->format();
   setFormat(surfaceFormat);
 
   mAbstractCamera = dynamic_cast<WbAbstractCamera *>(mDevice);