Pass mempool pointer to UnloadBlockIndex

src/qt/test/apptests.cpp

@@ -83,7 +83,7 @@ void AppTests::appTests()
     // Reset global state to avoid interfering with later tests.
     LogInstance().DisconnectTestLogger();
     AbortShutdown();
-    UnloadBlockIndex();
+    UnloadBlockIndex(/* mempool */ nullptr);
     WITH_LOCK(::cs_main, g_chainman.Reset());
 }