modified: Removed PassiveDNS object

[0xh7ml]

This pull request removes the PassiveDNS class and its associated functionality from the sublist3r.py script. The changes include the deletion of the class definition, its methods, and references to it in the main function.

The most important changes include:

Removal of PassiveDNS class and methods:

• sublist3r.py: Removed the entire PassiveDNS class, including its __init__, req, enumerate, and extract_domains methods.

Updates to the main function:

• sublist3r.py: Removed the PassiveDNS entry from the enum_dict dictionary in the main function.
• sublist3r.py: Removed PassiveDNS from the chosenEnums list in the main function.

[0xh7ml]

This PR resolve #391