[FIX] Set last date invoiced not readonly

[angelmoya]

If you do wrong invoice on contract, you can not re invoice with right data...

For example, set recurring invoice type as post-paid, create first invoice, set next invoice to previous date to re invoice and then data is not right.

Any problem to unset readonly? Finally this field is visible only to technical user so I think no problem

[rousseldenis]

@angelmoya Please review this one instead. https://github.com/OCA/contract/pull/810

As this is a critical field, that approach is better.

[github-actions[bot]]

There hasn't been any activity on this pull request in the past 4 months, so it has been marked as stale and it will be closed automatically if no further activity occurs in the next 30 days. If you want this PR to never become stale, please ask a PSC member to apply the "no stale" label.

[rousseldenis]

@mourad-ehm Could you look at #810 ?

[pedrobaeza]

Closing, as #810 is being merged.