Tmux: remove 'R' utf-8 symbol on left status bar

'R' utf-8 is not displayed properly in ubuntu env though it works in
fedora env. This patch removes this.

Signed-off-by: Ratheesh S <ratheeshreddy@gmail.com>
Tested-by: Ratheesh S <ratheeshreddy@gmail.com>
Tmux: point default conf to noutf8 version

noutf8 is simple version and works in all env including MS. This is to
by default avoid ugly utf8 symbols displayed by ultra stable old PuTTY
env!!!
Tmux: cosmetic changes

Signed-off-by: Ratheesh S <ratheeshreddy@gmail.com>
Tested-by: Ratheesh S <ratheeshreddy@gmail.com>