Fix mjolnir private chat enum

src/mjolnir/Mjolnir.ts

@@ -20,6 +20,7 @@ import SettingsStore from "../settings/SettingsStore";
 import {_t} from "../languageHandler";
 import dis from "../dispatcher/dispatcher";
 import {SettingLevel} from "../settings/SettingLevel";
+import { Preset } from "../createRoom";
 
 // TODO: Move this and related files to the js-sdk or something once finalized.
 
@@ -86,7 +87,7 @@ export class Mjolnir {
             const resp = await MatrixClientPeg.get().createRoom({
                 name: _t("My Ban List"),
                 topic: _t("This is your list of users/servers you have blocked - don't leave the room!"),
-                preset: "private_chat",
+                preset: Preset.PrivateChat,
             });
             personalRoomId = resp['room_id'];
             await SettingsStore.setValue(