winex11.drv: Fix handle_wm_protools take focus error cause tooltip window and popup menu not visible

[Changhui Liu]

Because some program's WNDPROC will return a zero value for WM_MOUSEACTIVATE,
so it can be not one of the following values. 
/*
 * WM_MOUSEACTIVATE Return Codes
 */
#define MA_ACTIVATE         1
#define MA_ACTIVATEANDEAT   2
#define MA_NOACTIVATE       3
#define MA_NOACTIVATEANDEAT 4












------------------
Regards,
Changhui.
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