Do not create transactions larger than the size of the penalty free zone

In order to observe block size pressure due to transactions volumes, it is
helpful to keep individual transaction sizes somewhat smaller so multiple
transactions are more likely to be packed into a block.

src/wallet/wallet2.h

@@ -142,7 +142,7 @@ namespace tools
     // free block size. TODO: fix this so that it actually takes
     // into account the current median block size rather than
     // the minimum block size.
-    void init(const std::string& daemon_address = "http://localhost:8080", uint64_t upper_transaction_size_limit = ((CRYPTONOTE_BLOCK_GRANTED_FULL_REWARD_ZONE * 125) / 100) - CRYPTONOTE_COINBASE_BLOB_RESERVED_SIZE);
+    void init(const std::string& daemon_address = "http://localhost:8080", uint64_t upper_transaction_size_limit = CRYPTONOTE_BLOCK_GRANTED_FULL_REWARD_ZONE - CRYPTONOTE_COINBASE_BLOB_RESERVED_SIZE);
     bool deinit();
 
     void stop() { m_run.store(false, std::memory_order_relaxed); }