Revert "enable bash autocomplete by default"

This reverts commit ee8e15fe76a235ae3583d4e8cb4bb370f28c5eae. See
discussion at https://github.com/NixOS/nixpkgs/commit/ee8e15fe76a235ae3583d4e8cb4bb370f28c5eae.

Changed files
+1 -1
nixos
modules
programs
bash
+1 -1
nixos/modules/programs/bash/bash.nix
···
};
enableCompletion = mkOption {
-
default = true;
+
default = false;
description = ''
Enable Bash completion for all interactive bash shells.
'';