2.0 packed_transaction zlib issue

[heifner]

Branch release/2.0
When normalizing packed_transaction that is zlib compressed, only the packed_trx is decompressed. See:

spring/libraries/chain/transaction.cpp

Line 327 in 8a7415a

packed_trx = zlib_decompress(packed_trx);

The packed_context_free_data also needs to be decompressed.

   if (!packed_context_free_data.empty()) {
      packed_context_free_data = zlib_decompress(packed_context_free_data);
   }