kdeApplications: split drv name into pname and version attributes

This change aims to make it easier to access the package name and
version individually when writing overlays for KDE derivations.

pkgs/applications/kde/default.nix

@@ -42,8 +42,8 @@ let
         libsForQt5.callPackage ({ mkDerivation }: mkDerivation) {};
     in
       mkDerivation (args // {
-        name = "${name}-${version}";
-        inherit src;
+        pname = name;
+        inherit src version;
 
         outputs = args.outputs or [ "out" ];