Only removing stage files in lb clean --stage and keep .build around in order...

Only removing stage files in lb clean --stage and keep .build around in order for init to detect initialized config directories properly.

scripts/build/clean

@@ -129,7 +129,7 @@ do
 			;;
 
 		--stage)
-			rm -rf .build
+			rm -rf .build/*
 			;;
 
 		--source)