Fix wrong exit in autoinstall/before.sh

.envrc

@@ -1,3 +1,3 @@
 use nix
 
-printf '\nPlease set and export $BASHLY_SOURCE_DIR\n\n'
+export BASHLY_SOURCE_DIR=$(cat .target)

autoinstall/before.sh

@@ -5,7 +5,7 @@ action=${action:?}
 # if action is run or completions, do nothing
 if [ "$action" = "run" ] || [ "$action" = "completions" ]
 then
-	exit 0
+	return
 fi
 
 clean=${args[--clean]:-}