Use display polling by default in WinVNC

Window hooks aren't working well on modern systems so switch the
default to polling until we can fix things.
diff --git a/win/rfb_win32/SDisplay.cxx b/win/rfb_win32/SDisplay.cxx
index be33ff1..06eccd9 100644
--- a/win/rfb_win32/SDisplay.cxx
+++ b/win/rfb_win32/SDisplay.cxx
@@ -45,7 +45,7 @@
 // - SDisplay-specific configuration options
 
 IntParameter rfb::win32::SDisplay::updateMethod("UpdateMethod",
-  "How to discover desktop updates; 0 - Polling, 1 - Application hooking, 2 - Driver hooking.", 1);
+  "How to discover desktop updates; 0 - Polling, 1 - Application hooking, 2 - Driver hooking.", 0);
 BoolParameter rfb::win32::SDisplay::disableLocalInputs("DisableLocalInputs",
   "Disable local keyboard and pointer input while the server is in use", false);
 StringParameter rfb::win32::SDisplay::disconnectAction("DisconnectAction",