Change height and width images of Category in homepage

Hi there,

A while ago I changed the size of the product-category images to 270 x270.
I did this in the file content-product_cat.php.

I changed $catimgheight = 130; to: $catimgheight = 270;
It worked perfectly, until the last update. I tried it again and copied the file into my child theme, but it doesn’t work anymore.
Their back to 130×270, but according to the file it should be 270×270.

Can anyone help with this problem?

Thank you!