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/oxygen-icons5.nix

@@ -1,14 +1,12 @@
 { mkDerivation
 , lib
-, extra-cmake-modules, qtbase
+, extra-cmake-modules
+, qtbase
 }:
 
 mkDerivation {
   name = "oxygen-icons5";
-  meta = {
-    license = lib.licenses.lgpl3Plus;
-    maintainers = [ lib.maintainers.ttuegel ];
-  };
+  meta.license = lib.licenses.lgpl3Plus;
   nativeBuildInputs = [ extra-cmake-modules ];
   buildInputs = [ qtbase ];
   outputs = [ "out" ]; # only runtime outputs