Kde/patches: refactor overlay function

roles/kde/patches/default.nix

@@ -1,6 +1,7 @@
 {lib, ...}: let
   rootDirs = builtins.readDir ./.;
   removeFiles = lib.attrsets.filterAttrs (n: v: v == "directory") rootDirs;
+  programsToPatch = builtins.attrNames removeFiles;
 
   getPatches = name:
     builtins.map (value: ./${name}/${value}) (builtins.attrNames (
@@ -11,14 +12,18 @@
     ));
 
   bigOverlay = final: prev:
-    builtins.mapAttrs (
-      name: _value:
-        prev."${name}".overrideAttrs {
-          version = prev."${name}".version + "-patched";
-          patches = prev."${name}".patches ++ getPatches name;
+    lib.attrsets.mergeAttrsList (
+      lib.lists.forEach programsToPatch (
+        program: let
+          unpatchedProgram = prev."${program}";
+        in {
+          "${program}" = unpatchedProgram.overrideAttrs {
+            version = "${unpatchedProgram.version}-patched";
+            patches = unpatchedProgram.patches ++ getPatches program;
+          };
         }
-    )
-    removeFiles;
+      )
+    );
 in {
   nixpkgs.overlays = [
     (