maintainers: remove dpflug

github account seems to have been deleted years ago

maintainers/maintainer-list.nix

···
     githubId = 349909;
     name = "David Percy";
   };
-  dpflug = {
-    email = "[e-mail]";
-    github = "dpflug";
-    githubId = 108501;
-    name = "David Pflug";
-  };
   dr460nf1r3 = {
     email = "[e-mail]";
     github = "dr460nf1r3";

pkgs/by-name/tq/tqsl/package.nix

···
     homepage = "https://www.arrl.org/tqsl-download";
     license = licenses.bsd3;
     platforms = platforms.linux;
-    maintainers = [ maintainers.dpflug ];
+    maintainers = [ ];
   };
 }