Fixed clearing of an export preset's name when deleting the one above it.

Deleting an export preset cleared the name of the item below it. This was
caused by ProjectExportDialog::_edit_preset(-1) which sets the deleted preset's
data to empty values. This on its turn called
ProjectExportDialog::_name_changed() which operates on the new current preset
(the one under the deleted item).

Fixes issue #10842

editor/project_export.cpp

@@ -425,9 +425,10 @@ void ProjectExportDialog::_delete_preset_confirm() {
 
 	int idx = presets->get_current();
 	parameters->edit(NULL); //to avoid crash
+	_edit_preset(-1);
 	EditorExport::get_singleton()->remove_export_preset(idx);
 	_update_presets();
-	_edit_preset(-1);
+	_edit_preset(presets->get_current());
 }
 
 Variant ProjectExportDialog::get_drag_data_fw(const Point2 &p_point, Control *p_from) {