a LabeledStatement should be in fact a StatementWithBody

This fixes output for:

    if (foo) {
        moo: if (bar) {
            break moo;
        }
    } else {
        baz();
    }

(the labeled statement must be outputted inside brackets)

lib/output.js

@@ -457,7 +457,7 @@ function OutputStream(options) {
     DEFPRINT(AST_LabeledStatement, function(self, output){
         self.label.print(output);
         output.colon();
-        self.statement.print(output);
+        self.body.print(output);
     });
     DEFPRINT(AST_SimpleStatement, function(self, output){
         self.body.print(output);