fixed window activation failure condition on macOS

[seongmin-kim]

Because of incorrect condition, I failed to activate a window with specified PID. Follows are issues that related with this problem. #robotgo/73

# line 1795

- if (AXUIElementPerformAction (window.mData->AxID, kAXRaiseAction) == kAXErrorSuccess) { /*...*/ }
+ if (AXUIElementPerformAction (window.mData->AxID, kAXRaiseAction) != kAXErrorSuccess) { /*...*/ }

[dkrutsko]

Thank you for this fix, I'll take a look and test this out!