[FIX] point_of_sale: prevent crash with float quantity when edit lot

Current behavior:
In the PoS if you add a tracked product that uses "kg" as uom
and change the quantity to any float value. After that if you try
to modify the lot number you get an error.

Steps to reproduce:
- Have PoS installed
- Create a tracked product that use kg as uom
- Open PoS session
- Add the product to the order and modify the quantity to any float
  value
- Click on the green lines to edit the lot number
- You get an error

opw-2861426

[FIX] point_of_sale: float_serial

Current behavior:

Steps to reproduce:

opw-2861426

closes odoo/odoo#92722

X-original-commit: 0aff8bb9484a23c0d875d3b12259dd4e0d51e716
Signed-off-by: Nicolas Lempereur (nle) <nle@odoo.com>
Signed-off-by: Engels Robin (roen) <roen@odoo.com>

addons/point_of_sale/static/src/js/models.js

@@ -1217,6 +1217,7 @@ class Orderline extends PosModel {
     getPackLotLinesToEdit(isAllowOnlyOneLot) {
         const currentPackLotLines = this.pack_lot_lines;
         let nExtraLines = Math.abs(this.quantity) - currentPackLotLines.length;
+        nExtraLines = Math.ceil(nExtraLines);
         nExtraLines = nExtraLines > 0 ? nExtraLines : 1;
         const tempLines = currentPackLotLines
             .map(lotLine => ({