scripted-diff: Add IWYU pragma keep to bitcoin-config.h includes

-BEGIN VERIFY SCRIPT-
 perl -0777 -pi -e 's/#if defined\(HAVE_CONFIG_H\)\n#include <config\/bitcoin-config.h>.*\n#endif.*\n/#include <config\/bitcoin-config.h> \/\/ IWYU pragma: keep\n/g' $( git grep -l '#include <config/bitcoin-config.h>' )
-END VERIFY SCRIPT-

src/wallet/test/db_tests.cpp

@@ -2,9 +2,7 @@
 // Distributed under the MIT software license, see the accompanying
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
-#if defined(HAVE_CONFIG_H)
-#include <config/bitcoin-config.h>
-#endif
+#include <config/bitcoin-config.h> // IWYU pragma: keep
 
 #include <boost/test/unit_test.hpp>
 

src/wallet/test/util.h

@@ -5,9 +5,7 @@
 #ifndef BITCOIN_WALLET_TEST_UTIL_H
 #define BITCOIN_WALLET_TEST_UTIL_H
 
-#if defined(HAVE_CONFIG_H)
-#include <config/bitcoin-config.h>
-#endif
+#include <config/bitcoin-config.h> // IWYU pragma: keep
 
 #include <addresstype.h>
 #include <wallet/db.h>