Remove unnecessary running() check in lua::thread::send()
Remove unnecessary running() check in lua::thread::send()

GLib will just queue the idle callbacks if no main loop is currently
running to process them.

This change removes the only way for lua::thread::send() to currently
fail. However, a latter change will re-introduce something here, so for
now the compiler is silenced via #[allow(dead_code)].

Signed-off-by: Uli Schlachter <346c0ad49ac8427b61b3b55abbe37dc0ebd524f2@znc.in>

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