Update pull request template to remove widget state item

Removed checklist item for saving widget states in notebooks.

Author: aloctavodia

.github/pull_request_template.md

@@ -19,7 +19,6 @@ Thank you so much for your PR! To help us review your contribution, please consi
 - [ ] Includes new or updated tests to cover the new feature
 - [ ] New features are properly documented (with an example if appropriate)
 - [ ] Includes a sample plot to visually illustrate the changes (only for plot-related functions)
-- [ ] Widget states have been properly saved (only for notebooks with widgets) [see](https://github.com/arviz-devs/preliz/wiki/Save-widgets-state) for details.
 
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