remove unused "default.nix.cmp" file

should have never been checked in

pkgs/additional/firefox-extensions/ctrl-shift-c-should-copy/default.nix.cmp

@@ -1,46 +0,0 @@
-{ stdenv, lib
-, fetchFromGitHub
-, unstableGitUpdater
-, zip
-}:
-
-stdenv.mkDerivation {
-  pname = "ctrl-shift-c-should-copy";
-  version = "unstable-2023-03-03";
-
-  src = fetchFromGitHub {
-    owner = "jscher2000";
-    repo = "Ctrl-Shift-C-Should-Copy";
-    rev = "d9e67f330d0e13fc3796e9d797f12450f75a8c6a";
-    hash = "sha256-AzH1rZFqEH8sovZZfJykvsEmCedEZWigQFHWHl6/PdE=";
-  };
-
-  nativeBuildInputs = [ zip ];
-
-  buildPhase = ''
-    zip -r extension.zip ./*
-  '';
-
-  installPhase = ''
-    install extension.zip $out
-  '';
-
-  passthru = {
-    extid = "ctrl-shift-c-copy@jeffersonscher.com";
-    updateScript = unstableGitUpdater { };
-  };
-
-  meta = {
-    homepage = "https://github.com/jscher2000/Ctrl-Shift-C-Should-Copy";
-    description = "Potential Firefox extension to intercept Ctrl+Shift+C, block opening developer tools, and copy the selection to the clipboard.";
-    longDescription = ''
-      it comes with several limitations:
-      - doesn't work on new-tab page
-      - doesn't work if the focus isn't on page content
-        - e.g. ctrl+shift+c from URL bar still brings up dev console, incorrectly.
-
-      the proper fix to disabling Ctrl+Shift+C seems to require compiling Firefox from source, as of their Quantum project post-2019.
-    '';
-    maintainer = with lib.maintainers; [ colinsane ];
-  };
-}