WX: HiDPI: NetPlay

Several refactors of GUI creation into separate functions where the
function was too large or intermixed different concerns making it hard
to modify.

Source/Core/DolphinWX/NetPlay/PadMapDialog.h

@@ -12,7 +12,9 @@
 class NetPlayClient;
 class NetPlayServer;
 class Player;
+class wxArrayString;
 class wxChoice;
+class wxSizer;
 
 class PadMapDialog final : public wxDialog
 {