make tests independent of the user's environment

Jonathan Poelenrequested to merge
work/jpoelen/independent-test into master

There's a KTextEditor::EditorPrivate::enableUnitTestMode(); function, which is incomplete, since javascript tests look for paths in the user environment.

Except that if you go through QStandardPaths::setTestModeEnabled(true);, you can simply replace unitTestMode() with QStandardPaths::isTestModeEnabled(); and the tests will pass. Should we delete enableUnitTestMode()/unitTestMode() and simply use QStandardPaths?

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