SI-6158 Restore compile error output under partest --show-log

Seems like the ifs and elses didn't quite survive e830a7c.

Before:

    ./test/partest --show-log test/files/run/foo.scala
    Testing individual files
    testing: [...]/files/run/foo.scala                                    [FAILED]

Now:

    ./test/partest --show-log test/files/run/foo.scala
    Testing individual files
    testing: [...]/files/run/foo.scala                                    [FAILED]
    foo.scala:1: error: expected class or object definition
    askdfjskl
    ^
    one error found
    1 of 1 tests failed (elapsed time: 00:00:01)

Author: retronym

src/partest/scala/tools/partest/nest/RunnerManager.scala

@@ -817,7 +817,7 @@ class RunnerManager(kind: String, val fileManager: FileManager, params: TestRunP
         if (passed exists (x => !x)) {
           if (fileManager.showDiff || isPartestDebug)
             NestUI.normal(testDiff)
-          else if (fileManager.showLog)
+          if (fileManager.showLog)
             showLog(logFile)
         }
       }