refactor: move DEFAULT_TXINDEX from validation to txindex

Author: fanquake

src/index/txindex.h

@@ -7,6 +7,8 @@
 
 #include <index/base.h>
 
+static constexpr bool DEFAULT_TXINDEX{false};
+
 /**
  * TxIndex is used to look up transactions included in the blockchain by hash.
  * The index is written to a LevelDB database and records the filesystem

src/node/caches.cpp

@@ -4,9 +4,9 @@
 
 #include <node/caches.h>
 
+#include <index/txindex.h>
 #include <txdb.h>
 #include <util/system.h>
-#include <validation.h>
 
 namespace node {
 CacheSizes CalculateCacheSizes(const ArgsManager& args, size_t n_indexes)

src/validation.h

@@ -65,7 +65,6 @@ static const int MAX_SCRIPTCHECK_THREADS = 15;
 static const int DEFAULT_SCRIPTCHECK_THREADS = 0;
 static const int64_t DEFAULT_MAX_TIP_AGE = 24 * 60 * 60;
 static const bool DEFAULT_CHECKPOINTS_ENABLED = true;
-static const bool DEFAULT_TXINDEX = false;
 static constexpr bool DEFAULT_COINSTATSINDEX{false};
 static const char* const DEFAULT_BLOCKFILTERINDEX = "0";
 /** Default for -stopatheight */