Disable resize function loacaly

Hello guys,

is it posible to take out the resize function within the crop function?
So that you only can move the cut frame?

For our website we need only 4:3 images on the post overview page.
To save that, it would be necessary that nobody can resize images, what would mean to stay into the 4:3 frame all the time.

Thanks for some codelines!

Best regards
Markus