[FIX] rma_sale: chained returns

Using move_dest_ids we can easily end in an infinite loop situation as
the return of the return of the return ends with some original moves on
in move_dest_ids. We must ensure to drop them to avoid the infinite
loop.

TT29886

rma/__manifest__.py

@@ -3,7 +3,7 @@
 {
     "name": "Return Merchandise Authorization Management",
     "summary": "Return Merchandise Authorization (RMA)",
-    "version": "13.0.1.2.0",
+    "version": "13.0.1.2.1",
     "development_status": "Production/Stable",
     "category": "RMA",
     "website": "https://github.com/OCA/rma",