[bash] statically define __fzf_list_hosts() with either method

When bash-completion (and thus `_known_hosts_real()`) is / is not available this
will typically not change during the lifetime of a shell.

The only exception is if the user would unset `_known_hosts_real()`, but well,
that would be his problem.

So we can easily define `__fzf_list_hosts()` either using `_known_hosts_real()`
or using the old code, and avoid checking every time whether
`_known_hosts_real()` is defined.

Signed-off-by: Christoph Anton Mitterer <mail@christoph.anton.mitterer.name>

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