daemon: don't print "(pruned)" for coinbase txes

Pruned coinbase txes are the same as unpruned ones, so the
prunable data is empty

src/daemon/rpc_command_executor.cpp

@@ -1001,7 +1001,9 @@ bool t_rpc_command_executor::print_transaction(crypto::hash transaction_hash,
     if (1 == res.txs.size())
     {
       // only available for new style answers
-      bool pruned = res.txs.front().prunable_as_hex.empty() && res.txs.front().prunable_hash != epee::string_tools::pod_to_hex(crypto::null_hash);
+      static const std::string empty_hash = epee::string_tools::pod_to_hex(crypto::cn_fast_hash("", 0));
+      // prunable_hash will equal empty_hash when nothing is prunable (mostly when the transaction is coinbase)
+      bool pruned = res.txs.front().prunable_as_hex.empty() && res.txs.front().prunable_hash != epee::string_tools::pod_to_hex(crypto::null_hash) && res.txs.front().prunable_hash != empty_hash;
       if (res.txs.front().in_pool)
         tools::success_msg_writer() << "Found in pool";
       else