Fix formatting to comply with linting rules

Issue: GREG-42

gregui/mailutils.py

@@ -7,16 +7,13 @@ def registration_template(institution, sponsor) -> str:
     keywords = {
         "institution": institution,
         "sponsor": sponsor,
-        "registration_link": "www.google.com"
+        "registration_link": "www.google.com",
     }
     return render_to_string("guest_registration.txt", keywords)
 
 
 def confirmation_template(guest) -> str:
-    keywords = {
-        "guest": guest,
-        "confirmation_link": "www.google.com"
-    }
+    keywords = {"guest": guest, "confirmation_link": "www.google.com"}
     return render_to_string("sponsor_confirmation.txt", keywords)
 
 
@@ -25,7 +22,7 @@ def send_registration_mail(mail_to, sponsor) -> int:
         subject="Subject",
         message=registration_template(settings.INSTANCE_NAME, sponsor),
         from_email=None,
-        recipient_list=[mail_to]
+        recipient_list=[mail_to],
     )
 
 
@@ -34,5 +31,5 @@ def send_confirmation_mail(mail_to, guest) -> int:
         subject="Subject",
         message=confirmation_template(guest),
         from_email=None,
-        recipient_list=[mail_to]
+        recipient_list=[mail_to],
     )