Toggle VSync Hotkey (#659)

* Added toggle vsync button and hotkeys section to config

* Uses hasflag instead of bitwise comparison

* fixed schema name

Co-Authored-By: BaronKiko <BaronKiko@users.noreply.github.com>

Ryujinx.HLE/Input/HidHotkeyButtons.cs

@@ -0,0 +1,10 @@
+using System;
+
+namespace Ryujinx.HLE.Input
+{
+    [Flags]
+    public enum HidHotkeyButtons
+    {
+        ToggleVSync = 1 << 0,
+    }
+}