wallet2: update stagenet rollback blocks

src/wallet/wallet2.cpp

@@ -12297,10 +12297,10 @@ uint64_t wallet2::get_approximate_blockchain_height() const
   const int seconds_per_block = DIFFICULTY_TARGET_V2;
   // Calculated blockchain height
   uint64_t approx_blockchain_height = fork_block + (time(NULL) - fork_time)/seconds_per_block;
-  // testnet got some huge rollbacks, so the estimation is way off
-  static const uint64_t approximate_testnet_rolled_back_blocks = 342100;
-  if (m_nettype == TESTNET && approx_blockchain_height > approximate_testnet_rolled_back_blocks)
-    approx_blockchain_height -= approximate_testnet_rolled_back_blocks;
+  // testnet and stagenet got some huge rollbacks, so the estimation is way off
+  static const uint64_t approximate_rolled_back_blocks = m_nettype == TESTNET ? 342100 : 30000;
+  if ((m_nettype == TESTNET || m_nettype == STAGENET) && approx_blockchain_height > approximate_rolled_back_blocks)
+    approx_blockchain_height -= approximate_rolled_back_blocks;
   LOG_PRINT_L2("Calculated blockchain height: " << approx_blockchain_height);
   return approx_blockchain_height;
 }