~/.tmux.conf: Don't mention tmux in the window title

.tmux.conf

@@ -10,7 +10,7 @@ set -g mouse on
set -g default-terminal "screen-256color"
set-option -g set-titles on
set-option -g set-titles-string "tmux(#I): #W #T"
set-option -g set-titles-string "[#I] #W #T"
set-option -g history-limit 1000000
set -g status-bg black