[FIX] stock: make reception report srollable

To Reproduce
============
- on settings enable Reception Reports
- for a storable product, create multiple sale orders (something above 10 depending on screen size)
- from purchase app make quotation for same product with quantity that covers these sale orders
- on deliver > allocation, the list is not scrollable

Problem
=======
The `div` containing the data doesn't have a style that makes it scrollable

Solution
========
add `overflow-y: auto;` to `.o_report_reception`

opw-3199037

closes odoo#114423

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

Author: abla001

addons/stock/static/src/scss/stock_traceability_report.scss

@@ -84,3 +84,6 @@
         }
     }
 }
+.o_report_reception {
+    overflow-y: auto;
+}