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/test/ismine_tests.cpp

@@ -6,8 +6,8 @@
 #include <key_io.h>
 #include <node/context.h>
 #include <script/script.h>
-#include <script/signingprovider.h>
 #include <script/standard.h>
+#include <script/signingprovider.h>
 #include <test/util/setup_common.h>
 #include <wallet/types.h>
 #include <wallet/wallet.h>