Fix crash on exit in some tests

It started occurring recently though the problem seems to be old.
Only KeyboardHandlerBase is the fix, the MouseHandler one is to be safe.

rpcs3/Emu/Io/KeyboardHandler.h

@@ -265,6 +265,7 @@ protected:
 public:
 	virtual void Init(const u32 max_connect)=0;
 	virtual void Close()=0;
+	virtual ~KeyboardHandlerBase() = default;
 
 	void Key(const u32 code, bool pressed)
 	{

rpcs3/Emu/Io/MouseHandler.h

@@ -106,6 +106,7 @@ protected:
 public:
 	virtual void Init(const u32 max_connect)=0;
 	virtual void Close()=0;
+	virtual ~MouseHandlerBase() = default;
 
 	void Button(u8 button, bool pressed)
 	{