refactor: removes unused imports

todolist/core/src/main/java/todolist/core/TodoModel.java

@@ -3,9 +3,7 @@ package todolist.core;
 import java.util.ArrayList;
 import java.util.Collection;
 import java.util.Iterator;
-import java.util.LinkedHashMap;
 import java.util.List;
-import java.util.Map;
 import java.util.function.Function;
 import todolist.core.TodoSettings.TodoItemsSortOrder;