resmim: Adjust TC_createMapping_busySlot to current bankd code

Since osmo-remsim Change-Id I83e319d22896b881c0d882542842f500075aa546
createMapping will overwrite any existing mappings that may already
exist for that bank-slot.  We need to adjust our test expectations
accordingly.

Change-Id: Ia8de9edd7edb0437cd783b7d045571ff69820c42
Related: OS#4278
1 file changed