chore(linux): Use `ibus start` if available

IBus around version 1.5.28 introduced the `start` subcommand for `ibus`.
If available we use that because that starts `ibus-daemon` with the
correct arguments. If the available IBus version is too old we use
our previous code where we pass arguments to `ibus-daemon` which might
be different from how ibus gets started on that system otherwise.