rearange sz.env and optimize for zsh

chezmoi.roots/_src.posix/private_dot_config/sz.env/broot.env

@@ -1,7 +1,8 @@
 #!/usr/bin/env -S bash -c 'echo "Not a user script. source(aka .) only"'
 
 if is_cmd broot; then
-    source /mnt/szmedia/USERDATA/home/sz/.config/broot/launcher/bash/br
+    . <(broot --print-shell-function "${SHELL##*/}")
+    broot --set-install-state installed
 fi
 
 # vim: set ft=sh expandtab tabstop=4 shiftwidth=4: