Don't worry about it. The total amount of force to hold it straight is spread over all the rivets. The amount of pull force on each rivet will be very small. If you do try to straighten it, be careful not to put too much of the correction in any one place. If you end up with a bit of a kink in it, now the loads will be much higher on a small number of rivets, which would be much worse than if you had just left it alone.