testdb: add override in a couple places where it's missing

src/blockchain_db/testdb.h

@@ -69,8 +69,8 @@ public:
   virtual cryptonote::blobdata get_block_blob(const crypto::hash& h) const override { return cryptonote::blobdata(); }
   virtual bool get_tx_blob(const crypto::hash& h, cryptonote::blobdata &tx) const override { return false; }
   virtual bool get_pruned_tx_blob(const crypto::hash& h, cryptonote::blobdata &tx) const override { return false; }
-  virtual bool get_pruned_tx_blobs_from(const crypto::hash& h, size_t count, std::vector<cryptonote::blobdata> &bd) const { return false; }
-  virtual bool get_blocks_from(uint64_t start_height, size_t min_count, size_t max_count, size_t max_size, std::vector<std::pair<std::pair<cryptonote::blobdata, crypto::hash>, std::vector<std::pair<crypto::hash, cryptonote::blobdata>>>>& blocks, bool pruned, bool skip_coinbase, bool get_miner_tx_hash) const { return false; }
+  virtual bool get_pruned_tx_blobs_from(const crypto::hash& h, size_t count, std::vector<cryptonote::blobdata> &bd) const override { return false; }
+  virtual bool get_blocks_from(uint64_t start_height, size_t min_count, size_t max_count, size_t max_size, std::vector<std::pair<std::pair<cryptonote::blobdata, crypto::hash>, std::vector<std::pair<crypto::hash, cryptonote::blobdata>>>>& blocks, bool pruned, bool skip_coinbase, bool get_miner_tx_hash) const override { return false; }
   virtual bool get_prunable_tx_blob(const crypto::hash& h, cryptonote::blobdata &tx) const override { return false; }
   virtual bool get_prunable_tx_hash(const crypto::hash& tx_hash, crypto::hash &prunable_hash) const override { return false; }
   virtual uint64_t get_block_height(const crypto::hash& h) const override { return 0; }