Match file dialog drive with the current folder.

scene/gui/file_dialog.cpp

@@ -115,6 +115,7 @@ Vector<String> FileDialog::get_selected_files() const {
 void FileDialog::update_dir() {
 
 	dir->set_text(dir_access->get_current_dir());
+	drives->select(dir_access->get_current_drive());
 }
 
 void FileDialog::_dir_entered(String p_dir) {