Update extensions for some files with types

This migrates one bucket of files using some amount of Flow typing to mark them
as TypeScript instead. The remaining type errors are fixed in subsequent
commits.

src/components/views/settings/tabs/user/HelpUserSettingsTab.tsx

@@ -23,7 +23,7 @@ import AccessibleButton from "../../../elements/AccessibleButton";
 import SdkConfig from "../../../../../SdkConfig";
 import createRoom from "../../../../../createRoom";
 import Modal from "../../../../../Modal";
-import * as sdk from "../../../../../";
+import * as sdk from "../../../../..";
 import PlatformPeg from "../../../../../PlatformPeg";
 import * as KeyboardShortcuts from "../../../../../accessibility/KeyboardShortcuts";
 import UpdateCheckButton from "../../UpdateCheckButton";