REPL tab completes $ suffix for objects

I tried the following in the new REPL from tag v0.4.0-RC1

```scala
scala> scala.Pre<TAB>
Predef$  Predef
scala> scala.Predef$<ENTER>
1 |scala.Predef$
  |^^^^^^^^^^^^^
  |value `Predef$` is not a member of scala - did you mean `scala.Predef`?
```
I expected it to tab complete to `Predef` without the $ suffix.