fix: replace <arpa/inet.h> with platform_compat.h in chatgui (cross-platform ntohs)

tools/chatgui/src/accountlist.cpp

@@ -5,7 +5,7 @@
 #include <QLabel>
 #include <QDateTime>
 #include <QFont>
-#include <arpa/inet.h>
+#include "../../../lib/platform_compat.h"
 
 static QString shortenKey(const QByteArray& key) {
     if (key.size() < 8) return key.toHex(' ').toUpper();

tools/chatgui/src/nodespage.cpp

@@ -10,7 +10,7 @@
 #include <QFont>
 #include <cstring>
 
-#include <arpa/inet.h>
+#include "../../../lib/platform_compat.h"
 
 static QString hex4(uint32_t v) {
     return QString("%1").arg(v, 4, 16, QChar('0')).toUpper();