www/librewolf: correct the package description

WWW within Makefile is correct.

Remove the WWW line (with a different URL) from pkg-descr.

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=258503#c32

PR:          258503
Reported by: VVD at comment 32
Fixes:       4e77dee www/librewolf: New port

www/librewolf/pkg-descr

@@ -9,5 +9,3 @@ many advanced features:
  o Themes
  o FastFind
  o Improved Security
-
-WWW: https://librewolf-community.gitlab.io/