Remove unused lines from fingerprint cmdline utility

Signed-off-by: Stan Janssen <stan.janssen@elaad.nl>

openleadr/fingerprint.py

@@ -11,7 +11,3 @@ def show_fingerprint():
         with open(args.certificate) as file:
             cert_str = file.read()
             print(certificate_fingerprint(cert_str))
-
-
-if __name__ == "__main__":
-    show_fingerprint()