Add button to reopen cancelled SR

CHANGELOG:

### Added
- [#833](https://gitlab.com/coopdevs/odoo-somconnexio/-/merge_requests/833) Add reopen button to cancelled SR

Related card: https://trello.com/c/tGSChbFb/1292-bot%C3%B3-passar-a-nou-en-les-sr-cancellades

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