The swastika is an ancient symbol that dates back many thousands of years, long before the Nazis used it.
I'm not sure why they chose to put it in the movie considering almost everyone associates it with the Nazis, but they made it pretty clear that they were referencing ancient culture with the other symbols around it. I think it represented different things throughout history, but the sun and thunder are two very common ones and there is a drawing of the sun above it and a cloud with thunder below it. There is also another recognizable ancient drawing to the right.