Fix the access for stock user to stock.quant.
Since the inventory adjustement feature has been moved on
the stock.quant. The user should be able to write on them to
make their count. However we kept that a stock user can't validate
an inventory nor modify quantities on product
closesodoo/odoo#69006
X-original-commit: 6b8d40ec494dfbcaaef0da438692c76d0088f671
Signed-off-by: Arnold Moyaux <amoyaux@users.noreply.github.com>