cp2k: move from pkgs/by-name to pkgs/applications

nixpkgs-vet CI check demands to move CP2K out of the pkgs/by-name tree

Author: sheepforce

pkgs/by-name/cp/cp2k/package.nix renamed to pkgs/applications/science/chemistry/cp2k/default.nix

@@ -14610,7 +14610,7 @@ with pkgs;
         };
       });
     in
-    grimmeCmake.callPackage ../by-name/cp/cp2k/package.nix {
+    grimmeCmake.callPackage ../applications/science/chemistry/cp2k/default.nix {
       libxc = pkgs.libxc_7;
     };