[IMP] rma: mark RMA location as return location

[JordiMForgeFlow]

FW of #484

[codecov-commenter]

Codecov Report

Merging #486 (0a89825) into 15.0 (ec11378) will not change coverage.
The diff coverage is n/a.

Additional details and impacted files

@@           Coverage Diff           @@
##             15.0     #486   +/-   ##
=======================================
  Coverage   80.60%   80.60%           
=======================================
  Files         152      152           
  Lines        4873     4873           
  Branches      757      757           
=======================================
  Hits         3928     3928           
  Misses        731      731           
  Partials      214      214           

Files	Coverage Δ
rma/models/stock_warehouse.py	78.82% <ø> (ø)

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