Add accelerator keys for Options and Help (#5884)

src/Ryujinx.Ava/Assets/Locales/en_US.json

@@ -14,7 +14,7 @@
   "MenuBarFileOpenEmuFolder": "Open Ryujinx Folder",
   "MenuBarFileOpenLogsFolder": "Open Logs Folder",
   "MenuBarFileExit": "_Exit",
-  "MenuBarOptions": "Options",
+  "MenuBarOptions": "_Options",
   "MenuBarOptionsToggleFullscreen": "Toggle Fullscreen",
   "MenuBarOptionsStartGamesInFullscreen": "Start Games in Fullscreen Mode",
   "MenuBarOptionsStopEmulation": "Stop Emulation",
@@ -30,7 +30,7 @@
   "MenuBarToolsManageFileTypes": "Manage file types",
   "MenuBarToolsInstallFileTypes": "Install file types",
   "MenuBarToolsUninstallFileTypes": "Uninstall file types",
-  "MenuBarHelp": "Help",
+  "MenuBarHelp": "_Help",
   "MenuBarHelpCheckForUpdates": "Check for Updates",
   "MenuBarHelpAbout": "About",
   "MenuSearch": "Search...",