fix #239 , use python-style templating instead of Jinja in the ec2 login_cmd_template

This file assumes Jinja templating for the port parameter and passes a Jinja-style "{{ port }}".

https://github.com/ansible/molecule/blob/main/src/molecule/command/login.py#L105

When it reaches molecule, it is subsituted in  this file and is done by python calling `.format()` on the string.
That causes it to not render correctly and gives users issues running
molecule login.

ref: #239

Author: danielpodwysocki

src/molecule_plugins/ec2/driver.py

@@ -195,10 +195,10 @@ def login_cmd_template(self):
             connection_options = " ".join(self.ssh_connection_options)
 
             return (
-                "ssh {{address}} "
-                "-l {{user}} "
-                "-p {{port}} "
-                "-i {{identity_file}} "
+                "ssh {address} "
+                "-l {user} "
+                "-p {port} "
+                "-i {identity_file} "
                 f"{connection_options}"
             )