terminator: use `dontWrapGApps` to fix desktop icon

Terminator is currently wrapped twice, which makes the python hook use a
wrapped executable name to set argv[0]. As a result, Terminator can't be
matched to its desktop entry and fails to group correctly in e.g. the GNOME app
launcher. Ensuring we only wrap the executable once solves this.

pkgs/applications/terminal-emulators/terminator/default.nix

···
 
   doCheck = false;
 
+  dontWrapGApps = true;
+
+  preFixup = ''
+    makeWrapperArgs+=("''${gappsWrapperArgs[@]}")
+  '';
+
   meta = with lib; {
     description = "Terminal emulator with support for tiling and tabs";
     longDescription = ''