🐛 Remove no longer needed `status-utf8` option from `tmux.conf`
🐛 Remove no longer needed `status-utf8` option from `tmux.conf`

Remove `set -g status-utf8 on` from the `tmux.conf` file as it is
no longer necessary, plus, it also triggers the following warning
on startup: "unknown option: status-utf8".

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Starting with tmux v2.2 the `status-utf8` option was removed since
the UTF-8 detection was made to happen automatically if the client
supports it.

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Ref:

  * https://github.com/tmux/tmux/blob/9a4b45dc0fdefead3fe9d471e144da78163860d0/CHANGES#L13-L19

      " UTF8 detection now happens automatically if the client
        supports it, hence the `mouse-utf8` and `utf8` options
        has been removed. "

  * https://github.com/tmux/tmux/issues/230

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