[BP 7.2.6] - XDCR - Fix to ensure that tombstones are replicated when FilterBinary is turned on

If Filter Binary is turned on, deletes are not replicated.

if filter.ShouldSkipBinaryDocs() && !dataTypeIsJson {        

  // Skip binary document             

  return false, nil, "", totalFailedDpCnt, FilteredOnOthers

}  

For UPR_DELETION the JsonBit in the datatype will be set to zero.
As a result the above if condition is evaluated to true and the document will be filtered and hence not replicated.

In summary, GoXDCR treats tombstones as binary docs.