fixup 'fix game freezes on droiding when using dsu #3453'

fixes #3486

(cherry-picked from commit 08bb6a4)

src/actions/undo.cpp

@@ -389,7 +389,7 @@ void undo_list::undo()
 		resources::recorder->redo(replay_data);
 		undos_.emplace_back(std::move(action));
 	}
-	if(std::all_of(undos_.begin(), undos_.begin(), [](const action_ptr_t& action){ return dynamic_cast<undo_action*>(action.get()) == nullptr; }))
+	if(std::all_of(undos_.begin(), undos_.end(), [](const action_ptr_t& action){ return dynamic_cast<undo_action*>(action.get()) == nullptr; }))
 	{
 		//clear the undo stack if it only contains dsu related actions, this in particular makes sure loops like `while(can_undo()) { undo(); }`always stop.
 		undos_.clear();