wallet_rpc_server: remove verbose field in incoming_transfers query

The key image (which was only supplied if verbose was true) is
readily available, not a secret key, and it was only modelled
after the CLI command because it's a bit spammy for the CLI.

src/wallet/wallet_rpc_server.cpp

@@ -1554,7 +1554,7 @@ namespace tools
         rpc_transfers.global_index = td.m_global_output_index;
         rpc_transfers.tx_hash      = epee::string_tools::pod_to_hex(td.m_txid);
         rpc_transfers.subaddr_index = {td.m_subaddr_index.major, td.m_subaddr_index.minor};
-        rpc_transfers.key_image    = req.verbose && td.m_key_image_known ? epee::string_tools::pod_to_hex(td.m_key_image) : "";
+        rpc_transfers.key_image    = td.m_key_image_known ? epee::string_tools::pod_to_hex(td.m_key_image) : "";
         res.transfers.push_back(rpc_transfers);
       }
     }

src/wallet/wallet_rpc_server_commands_defs.h

@@ -883,13 +883,11 @@ namespace wallet_rpc
       std::string transfer_type;
       uint32_t account_index;
       std::set<uint32_t> subaddr_indices;
-      bool verbose;
 
       BEGIN_KV_SERIALIZE_MAP()
         KV_SERIALIZE(transfer_type)
         KV_SERIALIZE(account_index)
         KV_SERIALIZE(subaddr_indices)
-        KV_SERIALIZE(verbose)
       END_KV_SERIALIZE_MAP()
     };