[partition] avoid data cleanup in osprobe

- Fixes #1044

src/modules/partition/tests/PartitionJobTests.cpp

@@ -2,6 +2,7 @@
  *
  *   Copyright 2014, Aurélien Gâteau <agateau@kde.org>
  *   Copyright 2017, Adriaan de Groot <groot@kde.org>
+ *   Copyright 2018, Philip Müller <philm@manjaro.org>
  *
  *   Calamares is free software: you can redistribute it and/or modify
  *   it under the terms of the GNU General Public License as published by
@@ -69,6 +70,7 @@ public:
 private:
     QString m_devicePath;
     QTemporaryDir m_mountPointDir;
+    m_mountPointDir.setAutoRemove(false); // Avoid data cleanup - https://github.com/calamares/calamares/issues/1044
     bool m_mounted;
 };