certificate table column nice_name is too small to support big amount of domain names

[skrivopishin]

Describe the bug
When you creating letsencrypt certificate with many domain names, e.g. 100, you get error message referenced to column nice_name in certificate table is too small. Currently it's 250 symbols, proposed value is 5000. Changing that will allow to create certificate normally.

Nginx Proxy Manager Version
2.12.3

To Reproduce
Steps to reproduce the behavior:

1. Send API request to create letsencrypt certificate
2. Get error

Expected behavior

1. Send API request to create letsencrypt certificate
2. Certificate should be created