config: default acceptnonstdtxn=0 on all chains

Previously, the default for acceptnonstdtxn defaulted to 0 on all
chains except testnet. Change this to be consistent across all
chains, and remove the parameter from chainparams entirely.

src/kernel/chainparams.cpp

@@ -151,7 +151,6 @@ public:
         vFixedSeeds = std::vector<uint8_t>(std::begin(chainparams_seed_main), std::end(chainparams_seed_main));
 
         fDefaultConsistencyChecks = false;
-        fRequireStandard = true;
         m_is_test_chain = false;
         m_is_mockable_chain = false;
 
@@ -259,7 +258,6 @@ public:
         vFixedSeeds = std::vector<uint8_t>(std::begin(chainparams_seed_test), std::end(chainparams_seed_test));
 
         fDefaultConsistencyChecks = false;
-        fRequireStandard = false;
         m_is_test_chain = true;
         m_is_mockable_chain = false;
 
@@ -382,7 +380,6 @@ public:
         bech32_hrp = "tb";
 
         fDefaultConsistencyChecks = false;
-        fRequireStandard = true;
         m_is_test_chain = true;
         m_is_mockable_chain = false;
     }
@@ -474,7 +471,6 @@ public:
         vSeeds.emplace_back("dummySeed.invalid.");
 
         fDefaultConsistencyChecks = true;
-        fRequireStandard = true;
         m_is_test_chain = true;
         m_is_mockable_chain = true;
 

src/kernel/chainparams.h

@@ -102,8 +102,6 @@ public:
     const CBlock& GenesisBlock() const { return genesis; }
     /** Default value for -checkmempool and -checkblockindex argument */
     bool DefaultConsistencyChecks() const { return fDefaultConsistencyChecks; }
-    /** Policy: Filter transactions that do not match well-defined patterns */
-    bool RequireStandard() const { return fRequireStandard; }
     /** If this chain is exclusively used for testing */
     bool IsTestChain() const { return m_is_test_chain; }
     /** If this chain allows time to be mocked */
@@ -179,7 +177,6 @@ protected:
     CBlock genesis;
     std::vector<uint8_t> vFixedSeeds;
     bool fDefaultConsistencyChecks;
-    bool fRequireStandard;
     bool m_is_test_chain;
     bool m_is_mockable_chain;
     CCheckpointData checkpointData;

src/kernel/mempool_options.h

@@ -23,6 +23,8 @@ static constexpr unsigned int DEFAULT_BLOCKSONLY_MAX_MEMPOOL_SIZE_MB{5};
 static constexpr unsigned int DEFAULT_MEMPOOL_EXPIRY_HOURS{336};
 /** Default for -mempoolfullrbf, if the transaction replaceability signaling is ignored */
 static constexpr bool DEFAULT_MEMPOOL_FULL_RBF{false};
+/** Default for -acceptnonstdtxn */
+static constexpr bool DEFAULT_ACCEPT_NON_STD_TXN{false};
 
 namespace kernel {
 /**