qt: Fix linking when configured with -DENABLE_WALLET=OFF

This change is required for Qt 6, but it is meaningful on its own.

Author: hebasto

src/qt/rpcconsole.cpp

@@ -16,7 +16,9 @@
 #include <qt/guiutil.h>
 #include <qt/peertablesortproxy.h>
 #include <qt/platformstyle.h>
+#ifdef ENABLE_WALLET
 #include <qt/walletmodel.h>
+#endif // ENABLE_WALLET
 #include <rpc/client.h>
 #include <rpc/server.h>
 #include <util/strencodings.h>