[FIX] account_asset_management: Proper asset unlink + move unlink

2 related fixes:

- When removing an asset line depreciation move, we have to pass it
  first to draft, or we won't be able to remove it even with the
  context.
- When removing a move, the check for removing the linked asset should
  be only for purchase documents, not for "not sale" documents.

account_asset_management/__manifest__.py

@@ -4,7 +4,7 @@
 
 {
     "name": "Assets Management",
-    "version": "13.0.1.3.1",
+    "version": "13.0.1.3.2",
     "license": "AGPL-3",
     "depends": ["account"],
     "excludes": ["account_asset"],

account_asset_management/models/account_asset_line.py

@@ -280,6 +280,7 @@ class AccountAssetLine(models.Model):
     def unlink_move(self):
         for line in self:
             move = line.move_id
+            move.button_draft()
             move.with_context(force_delete=True, unlink_from_asset=True).unlink()
             # trigger store function
             line.with_context(unlink_from_asset=True).write({"move_id": False})

account_asset_management/models/account_move.py

@@ -92,7 +92,7 @@ class AccountMove(models.Model):
                 move.message_post(body=message)
 
     def button_draft(self):
-        invoices = self.filtered(lambda r: not r.is_sale_document())
+        invoices = self.filtered(lambda r: r.is_purchase_document())
         if invoices:
             invoices.line_ids.asset_id.unlink()
         super().button_draft()