Remove newline in UserReportHead

mail_config.py

@@ -31,6 +31,5 @@ Whole_mail = Head + Body
 
 UserReportHead = f"""From: {Sender_alias} <{Sender}>
 To: <{Admin_email}>
-Subject: RC Account Creation Report: {{{{ fullname }}}}, {{{{ username }}}}
-"""
+Subject: RC Account Creation Report: {{{{ fullname }}}}, {{{{ username }}}} """