tests: Reduce compilation time and unneccessary recompiles by removing unused includes in tests

src/test/sigopcount_tests.cpp

@@ -2,8 +2,8 @@
 // Distributed under the MIT software license, see the accompanying
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
+#include <consensus/consensus.h>
 #include <consensus/tx_verify.h>
-#include <consensus/validation.h>
 #include <pubkey.h>
 #include <key.h>
 #include <script/script.h>