ruff: Partially reformat Python with Ruff 0.9 (2025 style).

These are the changes that are backwards compatible with the 2024
style.

Signed-off-by: Anders Kaseorg <anders@zulip.com>
(cherry picked from commit 653b0b0436)

zerver/forms.py

@@ -275,9 +275,7 @@ class HomepageForm(forms.Form):
         if not from_multiuse_invite and realm.invite_required:
             raise ValidationError(
                 _(
-                    "Please request an invite for {email} "
-                    "from the organization "
-                    "administrator."
+                    "Please request an invite for {email} from the organization administrator."
                 ).format(email=email)
             )