disable tty echo for the whole duration of wizard

internal/wizard.zsh

@@ -310,7 +310,6 @@ functions -M get_columns 0 0
 function render_screen() {
   {
     hide_cursor
-    stty -echo 2>/dev/null
     while true; do
       while true; do
         typeset -gi wizard_columns='get_columns()'
@@ -362,7 +361,6 @@ function render_screen() {
       done
     done
   } always {
-    stty echo 2>/dev/null
     show_cursor
   }
 }
@@ -1919,6 +1917,8 @@ else
   local -ir has_truecolor=0
 fi
 
+stty -echo 2>/dev/null
+
 while true; do
   local instant_prompt=verbose zshrc_content= zshrc_backup= zshrc_backup_u=
   local -i zshrc_has_cfg=0 zshrc_has_instant_prompt=0 write_zshrc=0