Revert pruning of redundant Java parents

This partially reverts the fix for SI-5278 made in 7a99c03da.
The original motivation for this case to avoid bytecode that
stretched platform limitations in Android.

For super calls to Scala defined trait methods, we won't
use `invokespecial`, but rather use `invokestatic` to a
static trait implementation method. As such, we can continue
to prune redundant Scala interfaces.

It might be worth considering removing the pruning of
redundant parents altoghether, though:

  - We no longer include `ScalaObject` as a parent of every class,
    which was mentioned as a problem in SI-5728.
  - Scala 2.12 has left Android behind for the time being
    due to use of Java 8 facilities.
  - javac doesn't do this, so why should we?

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