Fix typo that resulted in math error (#6731)

[emotty] fix typo that resulted in math error

plugins/emotty/emotty.plugin.zsh

@@ -26,7 +26,7 @@ function emotty() {
   # Use emotty set defined by user, fallback to default
   local emotty=${_emotty_sets[${emotty_set:-$emotty_default_set}]}
   # Parse $TTY number, normalizing it to an emotty set index
-  (( tty = (${TTY##/dev/ttys} % ${#${=emotty}}) + 1 ))
+  (( tty = (${TTY##/dev/tty} % ${#${=emotty}}) + 1 ))
   local character_name=${${=emotty}[tty]}
   echo "${emoji[${character_name}]}${emoji2[emoji_style]}"
 }