2975afaf1d
The return value currently indicates whether the request was successful, namely `setCompletionEnabled(false)` will return `true` if completions were successfully disabled. However the only caller that uses the value uses it to indicate whether completions were enabled. Given that nothing else uses the value, change the meaning to match the caller, and indicate whether completions are enabled after the call returns. Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/3439>