fixed terminal overrides for tmux

ansible/roles/tmux/files/tmux/tmux.conf

@@ -46,7 +46,7 @@ unbind %
 set -g mouse off
 
 # Set the default terminal
-set -s default-terminal 'kitty'
+set -s default-terminal 'tmux-256color'
 
 # Longer workspace names
 set -g status-left-length 20
@@ -58,7 +58,8 @@ set-option -sg escape-time 10
 set-option -g focus-events on
 
 # Terminal feature specific to Neovim
-set-option -sa terminal-overrides ',kitty:Tc'
+set-option -sa terminal-overrides ',tmux-256color:Tc'
+set-option -as terminal-features ',xterm-kitty:RGB'
 set -as terminal-overrides ',*:Smulx=\E[4::%p1%dm'  # undercurl support
 set -as terminal-overrides ',*:Setulc=\E[58::2::%p1%{65536}%/%d::%p1%{256}%/%{255}%&%d::%p1%{255}%&%d%;m'  # underscore colours - needs tmux-3.0