[KDEPlatformFileDialog] Don't do stat if baseUrl didn't change
Qt might call `setDirectory` twice on dialog initialization, the second one coming from `restoreFromSettings`. This would needlessly trigger another `StatJob` if the URL didn't change.
Qt might call `setDirectory` twice on dialog initialization, the second one coming from `restoreFromSettings`. This would needlessly trigger another `StatJob` if the URL didn't change.
mentioned in commit 46a8c287