Fix "UI" abbreviation being miscapitalized (#4093)

Ryujinx.Ava/Assets/Locales/en_US.json

@@ -280,7 +280,7 @@
   "ControllerSettingsRemoveProfileToolTip": "Remove Profile",
   "ControllerSettingsSaveProfileToolTip": "Save Profile",
   "MenuBarFileToolsTakeScreenshot": "Take Screenshot",
-  "MenuBarFileToolsHideUi": "Hide Ui",
+  "MenuBarFileToolsHideUi": "Hide UI",
   "GameListContextMenuToggleFavorite": "Toggle Favorite",
   "GameListContextMenuToggleFavoriteToolTip": "Toggle Favorite status of Game",
   "SettingsTabGeneralTheme": "Theme",