Refactoring in TestScalaIndenter

- Activate this test
- Rename to ScalaAutoIndentStrategyTest
- Replace existing test evaluation with the newer one from
  AutoEditStrategyTests

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Further tests will follow. A 170 LOC TestSuite for a 3k LOC implementation is nothing, but a bad joke.

Btw, this is the first time I didn't have problems with trailing whitespace. ;)