fix vim colors for tmuxinator as well

zsh/omz-custom/tmux.zsh

@@ -3,3 +3,5 @@
 # We need to force a TERM type for tmux
 # Ensure that the terminal emulator also reports TERM as 'screen-256color'
 alias tmux='TERM=screen-256color tmux'
+# Seems to be needed for tmuxinator as well
+alias mux='TERM=screen-256color mux'