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

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

src/wallet/test/coinselector_tests.cpp

@@ -12,6 +12,7 @@
 #include <wallet/coincontrol.h>
 #include <wallet/coinselection.h>
 #include <wallet/spend.h>
+#include <wallet/test/util.h>
 #include <wallet/test/wallet_test_fixture.h>
 #include <wallet/wallet.h>
 

src/wallet/test/group_outputs_tests.cpp

@@ -6,6 +6,7 @@
 
 #include <wallet/coinselection.h>
 #include <wallet/spend.h>
+#include <wallet/test/util.h>
 #include <wallet/wallet.h>
 
 #include <boost/test/unit_test.hpp>

src/wallet/test/wallet_test_fixture.cpp

@@ -2,6 +2,7 @@
 // Distributed under the MIT software license, see the accompanying
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
+#include <wallet/test/util.h>
 #include <wallet/test/wallet_test_fixture.h>
 
 #include <scheduler.h>