Remove unused includes from blockfilter.h

This removes unused includes, primitives/block found manually, and the
others by iwyu:

blockfilter.h should remove these lines:
- #include <serialize.h>  // lines 16-16
- #include <undo.h>  // lines 18-18

src/blockfilter.h

@@ -5,19 +5,22 @@
 #ifndef BITCOIN_BLOCKFILTER_H
 #define BITCOIN_BLOCKFILTER_H
 
-#include <stdint.h>
-#include <string>
+#include <cstddef>
+#include <cstdint>
+#include <ios>
 #include <set>
+#include <string>
 #include <unordered_set>
+#include <utility>
 #include <vector>
 
 #include <attributes.h>
-#include <primitives/block.h>
-#include <serialize.h>
 #include <uint256.h>
-#include <undo.h>
 #include <util/bytevectorhash.h>
 
+class CBlock;
+class CBlockUndo;
+
 /**
  * This implements a Golomb-coded set as defined in BIP 158. It is a
  * compact, probabilistic data structure for testing set membership.