[IMP] rma: mark RMA location as return location

[JordiMForgeFlow]

FW of #484

[codecov-commenter]

Codecov Report

Merging #485 (c11ec5b) into 16.0 (0525754) will not change coverage.
The diff coverage is n/a.

Additional details and impacted files

@@           Coverage Diff           @@
##             16.0     #485   +/-   ##
=======================================
  Coverage   81.04%   81.04%           
=======================================
  Files         128      128           
  Lines        4822     4822           
  Branches      779      779           
=======================================
  Hits         3908     3908           
  Misses        701      701           
  Partials      213      213           

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

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