test: Add extra_args argument to TestChain100Setup constructor

This will be needed in a later commit.

src/test/util/setup_common.cpp

@@ -205,7 +205,8 @@ TestingSetup::TestingSetup(const std::string& chainName, const std::vector<const
     }
 }
 
-TestChain100Setup::TestChain100Setup()
+TestChain100Setup::TestChain100Setup(const std::vector<const char*>& extra_args)
+    : TestingSetup{CBaseChainParams::REGTEST, extra_args}
 {
     SetMockTime(1598887952);
     constexpr std::array<unsigned char, 32> vchKey = {

src/test/util/setup_common.h

@@ -113,8 +113,8 @@ class CScript;
 /**
  * Testing fixture that pre-creates a 100-block REGTEST-mode block chain
  */
-struct TestChain100Setup : public RegTestingSetup {
-    TestChain100Setup();
+struct TestChain100Setup : public TestingSetup {
+    TestChain100Setup(const std::vector<const char*>& extra_args = {});
 
     /**
      * Create a new block with just given transactions, coinbase paying to