fuzz: Drop unused version from fuzz input format

src/test/fuzz/block.cpp

@@ -13,7 +13,6 @@
 #include <test/fuzz/fuzz.h>
 #include <util/chaintype.h>
 #include <validation.h>
-#include <version.h>
 
 #include <cassert>
 #include <string>
@@ -25,12 +24,9 @@ void initialize_block()
 
 FUZZ_TARGET(block, .init = initialize_block)
 {
-    CDataStream ds(buffer, SER_NETWORK, INIT_PROTO_VERSION);
+    DataStream ds{buffer};
     CBlock block;
     try {
-        int nVersion;
-        ds >> nVersion;
-        ds.SetVersion(nVersion);
         ds >> TX_WITH_WITNESS(block);
     } catch (const std::ios_base::failure&) {
         return;