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/Config.jsonc

@@ -84,6 +84,10 @@
             "button_plus": "Plus",
             "button_r": "U",
             "button_zr": "O"
+        },
+
+        "hotkeys": {
+            "toggle_vsync": "Tab"
         }
     },