Revert "Fix block.fees() (exclude coinbase)."

This reverts commit 35deaf5.

Author: evoskuil

src/chain/block.cpp

@@ -671,17 +671,13 @@ static uint64_t block_subsidy(size_t height, uint64_t subsidy_interval,
 
 uint64_t block::fees() const NOEXCEPT
 {
-    if (txs_->empty())
-        return {};
-
     // Overflow returns max_uint64.
     const auto value = [](uint64_t total, const auto& tx) NOEXCEPT
     {
         return ceilinged_add(total, tx->fee());
     };
 
-    return std::accumulate(std::next(txs_->begin()), txs_->end(),
-        uint64_t{}, value);
+    return std::accumulate(txs_->begin(), txs_->end(), uint64_t{}, value);
 }
 
 uint64_t block::claim() const NOEXCEPT