[FIX] stock: update quantity when products are grouped

- Go Inventory > Master Data > Products
- Group by Category
- Go to a product
- Click on 'Update Inventory'

An error is raised because the field `categ_id` doesn't exist on
`stock.quant`.

opw-2161129

closes odoo/odoo#42964

X-original-commit: 901d60cd90f1e6ba0fd6502c04619193d3ca1c7b
Signed-off-by: Nicolas Martinelli (nim) <nim@odoo.com>

addons/stock/models/stock_quant.py

@@ -617,13 +617,15 @@ class StockQuant(models.Model):
         :param extend: If True, enables form, graph and pivot views. False by default.
         """
         self._quant_tasks()
+        ctx = dict(self.env.context or {})
+        ctx.pop('group_by', None)
         action = {
             'name': _('Update Quantity'),
             'view_type': 'tree',
             'view_mode': 'list',
             'res_model': 'stock.quant',
             'type': 'ir.actions.act_window',
-            'context': self.env.context,
+            'context': ctx,
             'domain': domain or [],
             'help': """
                 <p class="o_view_nocontent_empty_folder">No Stock On Hand</p>