Whenever -blocksonly is specified, there is implicitly a zero size mempool. However, there is still a non-zero value for -maxmempool which will be shared with dbcache, leading to 300 MB extra usage. Fix this.
#include <nodemempool_args.h>
#include <nodemempool_persist_args.h>
#include <nodeminer.h>
#include <nodetxreconciliation.h>
#include <nodevalidation_cache_args.h>
#include <policyfeerate.h>
#include <policyfees.h>
#include <policyfees_args.h>
#include <policypolicy.h>
#include <policysettings.h>
#include <protocol.h>
#include <rpcblockchain.h>
#include <rpcregister.h>
#include <rpcserver.h>
#include <rpcutil.h>
#include <scheduler.h>
#include <scriptsigcache.h>
#include <scriptstandard.h>
#include <shutdown.h>
#include <sync.h>
#include <timedata.h>
#include <torcontrol.h>
#include <txdb.h>
#include <txmempool.h>
#include <utilasmap.h>
#include <utilcheck.h>
#include <utilmoneystr.h>
#include <utilstrencodings.h>
#include <utilstring.h>
#include <utilsyscall_sandbox.h>