Mark asmap const in statistics code

src/net.cpp

@@ -498,7 +498,7 @@ void CNode::SetAddrLocal(const CService& addrLocalIn) {
 
 #undef X
 #define X(name) stats.name = name
-void CNode::copyStats(CNodeStats &stats, std::vector<bool> &m_asmap)
+void CNode::copyStats(CNodeStats &stats, const std::vector<bool> &m_asmap)
 {
     stats.nodeid = this->GetId();
     X(nServices);

src/net.h

@@ -983,7 +983,7 @@ public:
 
     void CloseSocketDisconnect();
 
-    void copyStats(CNodeStats &stats, std::vector<bool> &m_asmap);
+    void copyStats(CNodeStats &stats, const std::vector<bool> &m_asmap);
 
     ServiceFlags GetLocalServices() const
     {