windows: Fix detection of Ctrl and Shift key presses

Credit for this fix goes to @poodle111

Commit 760de9915b broke the detection of
Ctrl and Shift key presses since it misses the VK_CONTROL and VK_SHIFT
virtual keys.

pcsx2/windows/WinKeyCodes.cpp

@@ -25,9 +25,11 @@ int TranslateVKToWXK(u32 keysym)
 	switch (keysym)
 	{
 	// Shift, Control, Alt and Menu
+	case VK_SHIFT:
 	case VK_LSHIFT:
 	case VK_RSHIFT: key_code = WXK_SHIFT; break;
 
+	case VK_CONTROL:
 	case VK_LCONTROL:
 	case VK_RCONTROL: key_code = WXK_CONTROL; break;