Different cursor styles also in TMUX

Set cursor style depending on the current mode also in TMUX.

.config/tmux/tmux.conf

@@ -1,6 +1,9 @@
 set -g default-terminal "tmux-256color"
 set -g mouse on
 
+# https://github.com/neovim/neovim/wiki/FAQ#cursor-shape-doesnt-change-in-tmux
+set -ga terminal-overrides '*:Ss=\E[%p1%d q:Se=\E[ q'
+
 # Set C-a as new prefix
 unbind C-b
 set-option -g prefix C-a