perlPackages: remove search.cpan.org; add metacpan.org default homepage

https://www.perl.com/article/saying-goodbye-to-search-cpan-org/

maybe one operation less

..with unifying recursiveUpdate and first //

although not tested

fix whitespace

pkgs/tools/graphics/graph-easy/default.nix

@@ -7,9 +7,8 @@ buildPerlPackage rec {
     url = "mirror://cpan/authors/id/S/SH/SHLOMIF/${name}.tar.gz";
     sha256 = "d4a2c10aebef663b598ea37f3aa3e3b752acf1fbbb961232c3dbe1155008d1fa";
   };
-  
+
   meta = with stdenv.lib; {
-    homepage = http://search.cpan.org/~tels/Graph-Easy/bin/graph-easy;
     description = "Render/convert graphs in/from various formats";
     license = licenses.gpl1;
     platforms = platforms.linux;