fix: pad 0 signed in when keyboard focused (KBM without gamepad)

4J_Input/Windows64/INP_Keyboard.h

@@ -90,6 +90,7 @@ public:
 	void SetMouseCaptured(bool captured);
 	void SetWindowFocused(bool focused);
 	bool IsMouseCaptured() const { return m_mouseCaptured; }
+	bool IsWindowFocused() const { return m_windowFocused; }
 
 	void SetMousePos(int x, int y) { m_mouseX = x; m_mouseY = y; }