Fix active Todos service behaviour (#1481)

* Return false instead of null in isTodosServiceAdded

* Resolve from TODOS_RECIPES_ID instead of hardcoded TODOS_RECIPE_ID

* Fix TodosWebview width toggling when isTodosServiceActive

* Add more todo service recipe IDs

* Refactor todos state management

* Moved todos service URL and recipe ID computation logic to todos/store
* Simplified TodosWebview by delegating to the store for the URL and
  removing the (unused) payment logic
* Made the todos service computation logic in the Service model depend
  on the logic in todos/store
* Made ServicesStore depend on the todos service logic from the Service
  model

* Todos appearance fixes

* Hide double horizontal rules if todo settings are hidden due to an
  added todo service
* Hide todos panel border when the panel is hidden or expanded
* Make expanded todos panel obey sidebar width and vertical style
  settings

* Make todos/store use isValidExternalURL

* Harden isValidExternalURL against malformed URLs

* Reduce todo URL string duplication in config.js

Co-authored-by: Kristóf Marussy <kristof@marussy.com>

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