fuzz: Move global node id counter along with other global state

The global m_headers_presync_stats is not reset in ResetAndInitialize.
This may lead to non-determinism.

Fix it by incrementing the global node id counter instead.

Without this patch, the tool would report a diff:

cargo run --manifest-path ./contrib/devtools/deterministic-fuzz-coverage/Cargo.toml -- $PWD/bld-cmake/ $PWD/../qa-assets/fuzz_corpora/ p2p_headers_presync 32

...
  2587|  3.73k|            if (best_it == m_headers_presync_stats.end()) {
   ------------------
-  |  Branch (2587:17): [True: 80, False: 3.65k]
+  |  Branch (2587:17): [True: 73, False: 3.66k]
   ------------------
...

Author: MarcoFalke

src/test/fuzz/p2p_headers_presync.cpp

@@ -54,7 +54,7 @@ void HeadersSyncSetup::ResetAndInitialize()
     auto& connman = static_cast<ConnmanTestMsg&>(*m_node.connman);
     connman.StopNodes();
 
-    NodeId id{0};
+    static NodeId id{0};
     std::vector<ConnectionType> conn_types = {
         ConnectionType::OUTBOUND_FULL_RELAY,
         ConnectionType::BLOCK_RELAY,