Don't print trees twice after parser

## Command
```
scalac test.scala -Xprint:parser
```
## Output:

```
parsed:
package <empty> {
  module object Test {
    def test = ???
  }
}
result of test.scala after parser:
package <empty> {
  module object Test {
    def test = ???
  }
}
```

## Expectation

The first output should be dropped.


