templates/minimal-flake-parts: Add meta.name

Add `meta.name` field for the flake parts template.
This is not quite ideal, because it still needs to be changed manually
after invocation of the template.

templates/minimal-flake-parts/clan.nix

@@ -4,6 +4,7 @@
     inputs.clan.flakeModules.default
   ];
   clan = {
+    meta.name = "__CHANGE_ME__";
     specialArgs = {
       inherit inputs;
     };