Switching to native file selectors (and hoping this looks OK)

This should fix issue 872 where mounted shares are not visible on Mac

src/gui_elements/FilePath.cc

@@ -187,14 +187,14 @@ void FilePath::openFile()
 	QString path;
 	if (path_only_) {
 		path = QFileDialog::getExistingDirectory(this, tr("Open Folder"), start_path,
-		    QFileDialog::DontUseNativeDialog | QFileDialog::ShowDirsOnly);
+		    QFileDialog::ShowDirsOnly);
 	} else {
 		if (io_mode == INPUT) {
 			path = QFileDialog::getOpenFileName(this, tr("Open File"), start_path,
-			    extensions_, nullptr, QFileDialog::DontUseNativeDialog | QFileDialog::DontConfirmOverwrite);
+			    extensions_, nullptr, QFileDialog::DontConfirmOverwrite);
 		} else if (io_mode == OUTPUT || io_mode == UNSPECIFIED) {
 			path = QFileDialog::getSaveFileName(this, tr("Open File"), start_path,
-			    extensions_, nullptr, QFileDialog::DontUseNativeDialog | QFileDialog::DontConfirmOverwrite);
+			    extensions_, nullptr, QFileDialog::DontConfirmOverwrite);
 		}
 	}