360 controller: Update default mapping. Put speed toggle on THUMBR instead of a trigger as the triggers are bouncy.

Common/KeyMap.cpp

@@ -79,8 +79,8 @@ static const DefMappingStruct default360KeyMap[] = {
 	{CTRL_LTRIGGER       , NKCODE_BUTTON_L1},
 	{CTRL_RTRIGGER       , NKCODE_BUTTON_R1},
 	{VIRTKEY_UNTHROTTLE  , JOYSTICK_AXIS_RTRIGGER, +1},
-	{VIRTKEY_PAUSE       , NKCODE_BUTTON_THUMBR},
-	{VIRTKEY_SPEED_TOGGLE, NKCODE_BUTTON_L2},
+	{VIRTKEY_SPEED_TOGGLE, NKCODE_BUTTON_THUMBR},
+	{VIRTKEY_PAUSE       , JOYSTICK_AXIS_LTRIGGER, +1},
 	{VIRTKEY_PAUSE,        NKCODE_HOME},
 };