Rename CalculateHeadersWork to CalculateClaimedHeadersWork

src/test/fuzz/headerssync.cpp

@@ -108,7 +108,7 @@ FUZZ_TARGET(headers_sync_state, .init = initialize_headers_sync_state_fuzz)
 
                     // If we get to redownloading, the presynced headers need
                     // to have the min amount of work on them.
-                    assert(CalculateHeadersWork(all_headers) >= min_work);
+                    assert(CalculateClaimedHeadersWork(all_headers) >= min_work);
                 }
             }