Switch to KeyboardMouse input type only when keyboard was used

Mouse events won't trigger the switch and UI reaction (displaying
different keybindings tips) now.
Sometimes you may want to use the mouse without using the keyboard and
keeping to use controller. In this case, UI reaction can be annoying. It
will be more pleasant after this commit.

src/xrEngine/xr_input.cpp

@@ -185,9 +185,6 @@ void CInput::MouseUpdate()
     const auto count = SDL_PeepEvents(events, MAX_MOUSE_EVENTS,
         SDL_GETEVENT, SDL_MOUSEMOTION, SDL_MOUSEWHEEL);
 
-    if (count)
-        SetCurrentInputType(KeyboardMouse);
-
     for (int i = 0; i < count; ++i)
     {
         const SDL_Event& event = events[i];