removed tmux <= 2.0 feature tests that cause orphan processes when using oh-my-zsh. Fixes #84 and #88 (2)

.tmux.conf

@@ -915,6 +915,8 @@ run 'cut -c3- ~/.tmux.conf | sh -s _apply_configuration'
 #     )
 #   fi
 #
+#   status_left="$status_left "
+#
 #   # -- status right style
 #
 #   tmux_conf_theme_status_right=${tmux_conf_theme_status_right-'#{pairing}#{prefix} #{battery_status} #{battery_bar} #{battery_percentage} , %R , %d %b | #{username} | #{hostname} '}