I can’t imagine a landlord would charge you for a patch by your bed where most people would place their feet when getting up.
If you were to move out your landlord would probably replace the carpet to attract new tenants, and the old one would go as fair wear and tear.
Just out of interest, how did your tenants ruin your carpets? I had a cat which scratched my carpet to heck when I was a tenant. I kept the place lovely but always put a rug over the bald patch when the landlord came round. I felt guilty when I moved out.