Fix another misleading indentation

Author: odersky

compiler/test/dotty/tools/repl/ShadowingTests.scala

@@ -33,7 +33,7 @@ object ShadowingTests:
     val subdir = dir.resolve(name)
     try Files.createDirectory(subdir)
     catch case _: java.nio.file.FileAlreadyExistsException =>
-    assert(Files.isDirectory(subdir), s"failed to create shadowed subdirectory $subdir")
+      assert(Files.isDirectory(subdir), s"failed to create shadowed subdirectory $subdir")
     subdir
 
   // The directory on the classpath containing artifacts to be shadowed