Settings: disable 'shortcut/windows/xbox/enable' by default, disablin…

…g XboxInput.

We're experiencing crashes on Windows x86.

We don't have much time to experiment, but disabling XboxInput works for
now.

src/mumble/Settings.cpp

@@ -414,7 +414,7 @@ Settings::Settings() {
 	bEnableEvdev = false;
 	bEnableXInput2 = true;
 	bEnableGKey = true;
-	bEnableXboxInput = true;
+	bEnableXboxInput = false;
 
 	for (int i=Log::firstMsgType; i<=Log::lastMsgType; ++i) {
 		qmMessages.insert(i, Settings::LogConsole | Settings::LogBalloon | Settings::LogTTS);