Pass chain and client variables where needed

This commit does not change behavior. All it does is pass new function
parameters.

It is easiest to review this change with:

    git log -p -n1 -U0 --word-diff-regex=.

src/wallet/test/wallet_test_fixture.cpp

@@ -9,7 +9,7 @@
 #include <wallet/rpcwallet.h>
 
 WalletTestingSetup::WalletTestingSetup(const std::string& chainName):
-    TestingSetup(chainName), m_wallet(WalletLocation(), WalletDatabase::CreateMock())
+    TestingSetup(chainName), m_wallet(*m_chain, WalletLocation(), WalletDatabase::CreateMock())
 {
     bool fFirstRun;
     m_wallet.LoadWallet(fFirstRun);