Set rounding mode back to default (TO_NEAREST) after randomx

Executing RandomX has side effects on the current rounding mode
depending on the hash program it generates and doesn't reset the
rounding mode after the fact. So explicitly set it after.

src/cryptonote_core/cryptonote_tx_utils.cpp

@@ -981,6 +981,7 @@ namespace cryptonote
   {
     blobdata bd = get_block_hashing_blob(b);
     rx_slow_hash(main_height, seed_height, seed_hash.data, bd.data(), bd.size(), res.data, 0, 1);
+    std::fesetround(FE_TONEAREST);
   }
 
   bool get_block_longhash(const Blockchain *pbc, const block& b, crypto::hash& res, const uint64_t height, const int miners)
@@ -993,7 +994,8 @@ namespace cryptonote
     const_cast<int &>(miners) = 0;
 #endif
 
-    if (hf_version >= network_version_12_checkpointing) {
+    if (hf_version >= network_version_12_checkpointing)
+    {
       uint64_t seed_height, main_height;
       crypto::hash hash;
       if (pbc != NULL)
@@ -1008,6 +1010,7 @@ namespace cryptonote
         main_height = 0;
       }
       rx_slow_hash(main_height, seed_height, hash.data, bd.data(), bd.size(), res.data, miners, 0);
+      std::fesetround(FE_TONEAREST);
       return true;
     }
 

src/cryptonote_core/service_node_rules.cpp

@@ -77,11 +77,8 @@ uint64_t get_staking_requirement(cryptonote::network_type m_nettype, uint64_t he
   uint64_t base = 0, variable = 0;
   if (hf_version >= cryptonote::network_version_11_infinite_staking)
   {
-    auto round_method = std::fegetround();
-    std::fesetround(FE_TONEAREST);
     base     = 15000 * COIN;
     variable = (25007.0 * COIN) / loki::exp2(height_adjusted/129600.0);
-    std::fesetround(round_method);
   }
   else
   {