AF2 multimer pkl support

[NicholasStevers]

Hello,

For those running a local instance of AF2 multimer from deepmind, you added pkl support to the interpreter, however, an earlier line prevents the script from launching.

Changing

if ".pdb" in pdb_path and pae_file_path.endswith(".json"):
to

if ".pdb" in pdb_path and (pae_file_path.endswith(".json") or pae_file_path.endswith(".pkl")):
allows the script to run.

Thank you for an awesome metric and tool to automate score generation!