docs: add found defect to TODO list

Author: Xiphereal

Desktop/TODO.md

@@ -1,4 +1,5 @@
-- refactor: use Commands and ViewModels instead of code behinds.
+- fix: Tasks are duplicated when reloading Task List view
+- refactor: use Commands and ViewModels instead of code behinds.
 - feat: allow for saving Tasks both locally and remotely at the same time
 - feat: tasks modifications are persisted
 - feat: style the front