wallet, tests: Include wallet/test/util.h

This will be needed for the following scripted-diff to work.

src/qt/test/addressbooktests.cpp

@@ -19,6 +19,7 @@
 #include <key.h>
 #include <key_io.h>
 #include <wallet/wallet.h>
+#include <wallet/test/util.h>
 #include <walletinitinterface.h>
 
 #include <chrono>

src/qt/test/wallettests.cpp

@@ -26,6 +26,7 @@
 #include <qt/walletmodel.h>
 #include <test/util/setup_common.h>
 #include <validation.h>
+#include <wallet/test/util.h>
 #include <wallet/wallet.h>
 
 #include <chrono>