[FIX] repair: hide cancel button in done state

Before this commit, the cancel button is visible in the done state and
on clicking showing the validation that it cannot be cancelled.

by the commit:
https://github.com/odoo/odoo/commit/8d37cf462badc25d911d3fa6d3382c6f7418904f
one of the cancel button in the form is made hidden in the done state,
similarly applying for the other cancel button also.

also currently on trying to delete a done repair order, it says to
cancel first and then delete the order, from the commit:
https://github.com/odoo/odoo/commit/8d37cf462badc25d911d3fa6d3382c6f7418904f


cancelling a done record is prevented, thus modifying the warning
message and its related pot file

After this commit, the cancel button will not be visible in the done
state.

closes odoo/odoo#117714

X-original-commit: e7981feb
Signed-off-by: William Henrotin (whe) <whe@odoo.com>