Clean up things that include script/standard.h

Remove standard.h from files that don't use anything in it, and include
it in files that do.

src/wallet/scriptpubkeyman.cpp

@@ -9,6 +9,7 @@
 #include <script/descriptor.h>
 #include <script/script.h>
 #include <script/sign.h>
+#include <script/standard.h>
 #include <util/bip32.h>
 #include <util/strencodings.h>
 #include <util/string.h>