[FIX] account: Remove is_move_sent change on reset to draft

Current Behavior:
is_move_sent is not updated if there is an existing invoice_pdf_report_id.

Purpose of this PR:
Remove the `is_move_sent`: False on when resetting the account move to draft.
This guarantees, that once the move has been sent via action_send_and_print, it will be marked as sent.

Steps to Reproduce on Runbot:
Create and Send and Print invoice. (is_move_sent is set to True)
Reset invoice to draft. (is_move_sent is set to False)
Confirm and resend invoice using Send and Print wizard. (is_move_sent remains False, expected to be changed to True)

Notes:
This PR #116698 added a _compute in Odoo 16, however it was removed in saas-16.3  with this PR #125392. is_move_sent is not updated on the second Send and Print because of the existing invoice_pdf_report_id (generated and linked during the first Send and Print).

opw-3849109

addons/account/models/account_move.py

@@ -4121,7 +4121,7 @@ def button_draft(self):
             move.mapped('line_ids.analytic_line_ids').unlink()
 
         self.mapped('line_ids').remove_move_reconcile()
-        self.write({'state': 'draft', 'is_move_sent': False})
+        self.state = 'draft'
 
     def button_cancel(self):
         self.write({'auto_post': 'no', 'state': 'cancel'})

addons/account/tests/test_account_move_send.py

@@ -880,3 +880,17 @@ def test_with_draft_invoices(self):
             self.create_send_and_print(invoice_draft)
         with self.assertRaises(UserError):
             self.create_send_and_print(invoice_posted + invoice_draft)
+
+    def test_out_invoice_is_move_sent(self):
+        invoice = self.init_invoice(move_type='out_invoice', amounts=[1000.0], post=True)
+        wizard = self.create_send_and_print(invoice)
+
+        self.assertEqual(invoice.state, 'posted')
+        self.assertFalse(invoice.is_move_sent)
+
+        wizard.action_send_and_print()
+        self.assertTrue(invoice.is_move_sent)
+
+        invoice.button_draft()
+        self.assertEqual(invoice.state, 'draft')
+        self.assertTrue(invoice.is_move_sent)