Fix output of test compilation

Previously the completed progressbar was removed when the tests finished

Author: nicolasstucki

compiler/test/dotty/tools/vulpix/ParallelTesting.scala

@@ -305,7 +305,7 @@ trait ParallelTesting extends RunnerOrchestration { self =>
         val timestamp = (System.currentTimeMillis - start) / 1000
         // println, otherwise no newline and cursor at start of line
         realStdout.print(
-          s"[=======================================] completed ($sourceCount/$sourceCount, $failureCount failed, ${timestamp}s)\r"
+          s"[=======================================] completed ($sourceCount/$sourceCount, $failureCount failed, ${timestamp}s)\n"
         )
       }
     }