db_lmdb: resize blockchain database when 90% filled

instead of a random ratio from 60% to 90%.

src/blockchain_db/lmdb/db_lmdb.cpp

@@ -545,8 +545,8 @@ bool BlockchainLMDB::need_resize(uint64_t threshold_size) const
   LOG_PRINT_L1("Space used:      " << size_used);
   LOG_PRINT_L1("Space remaining: " << mei.me_mapsize - size_used);
   LOG_PRINT_L1("Size threshold:  " << threshold_size);
-  float resize_percent_old = RESIZE_PERCENT;
-  LOG_PRINT_L1(boost::format("Percent used: %.04f  Percent threshold: %.04f") % ((double)size_used/mei.me_mapsize) % resize_percent_old);
+  float resize_percent = RESIZE_PERCENT;
+  LOG_PRINT_L1(boost::format("Percent used: %.04f  Percent threshold: %.04f") % ((double)size_used/mei.me_mapsize) % resize_percent);
 
   if (threshold_size > 0)
   {
@@ -559,10 +559,6 @@ bool BlockchainLMDB::need_resize(uint64_t threshold_size) const
       return false;
   }
 
-  std::mt19937 engine(std::random_device{}());
-  std::uniform_real_distribution<double> fdis(0.6, 0.9);
-  double resize_percent = fdis(engine);
-
   if ((double)size_used / mei.me_mapsize  > resize_percent)
   {
     LOG_PRINT_L1("Threshold met (percent-based)");

src/blockchain_db/lmdb/db_lmdb.h

@@ -450,7 +450,7 @@ private:
 #endif
 #endif
 
-  constexpr static float RESIZE_PERCENT = 0.8f;
+  constexpr static float RESIZE_PERCENT = 0.9f;
 };
 
 }  // namespace cryptonote