chg: Quick cleanup

Author: Rafiot

pymisp/tools/emailobject.py

@@ -158,10 +158,7 @@ def _build_eml(self, message: EmailMessage, body: dict[str, Any], attachments: l
                                                           body.get('html'),
                                                           body.get('rtf')] if i is not None]
         # If this a non-multipart email then we only need to attach the payload
-        if (
-            message.get_content_maintype() != "multipart" and
-            "application/ms-tnef" not in message.get("content-type", message.get_content_maintype())
-        ):
+        if message.get_content_maintype() != "multipart" and message.get_content_type() != 'application/ms-tnef':
             for _body in body_objects:
                 if "text/{}".format(_body['subtype']) == message.get_content_type():
                     message.set_content(**_body)