[FIX] stock: fix report.stock.quantity search_read

	Currently `report.stock.quantity` has a field defined in it called `move_ids`:
	`move_ids = fields.One2many('stock.move',readonly=True)`

	This virtual field has no corresponding inverse field so when performing a search_read on the model, it fails
	in fields.py when trying to do:	`inverse_field = comodel._fields[inverse]`

	In addition, this field is apparently not used anywhere in the source code and not queried in the SQL View.

	This means the model can never be search_read by default.

	Since this field is never used, it isn't stored, and the model is `_auto = False`, removing it won't break any database.

closes odoo/odoo#120048

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