kdeFrameworks: remove redundant maintainer lists

I am automatically a maintainer of all packages in the set, so there is not
reason to mention me explicitly as the maintainer of every individual package.

pkgs/development/libraries/kde-frameworks/threadweaver.nix

@@ -1,14 +1,11 @@
 {
-  mkDerivation, lib,
+  mkDerivation,
   extra-cmake-modules,
   qtbase
 }:
 
 mkDerivation {
   name = "threadweaver";
-  meta = {
-    maintainers = [ lib.maintainers.ttuegel ];
-  };
   nativeBuildInputs = [ extra-cmake-modules ];
   propagatedBuildInputs = [ qtbase ];
   outputs = [ "out" "dev" ];