Adjust some types

ts/util/getThemeType.ts

@@ -0,0 +1,18 @@
+// Copyright 2022 Signal Messenger, LLC
+// SPDX-License-Identifier: AGPL-3.0-only
+
+import { ThemeType } from '../types/Util';
+
+export function getThemeType(): ThemeType {
+  const themeSetting = window.Events.getThemeSetting();
+
+  if (themeSetting === 'light') {
+    return ThemeType.light;
+  }
+
+  if (themeSetting === 'dark') {
+    return ThemeType.dark;
+  }
+
+  return window.systemTheme;
+}