Fix an issue with the migration test failing intermittently.

source/storage/exports.ts

@@ -1,4 +1,4 @@
-import {createValue} from "@holllo/webextension-storage";
+import {createValue, type Value} from "@holllo/webextension-storage";
 import browser from "webextension-polyfill";
 import {Data, Feature} from "./enums.js";
 import {collectHideTopicsData} from "./hide-topics.js";

source/storage/migrations/migrations.ts

@@ -50,6 +50,7 @@ export const migrations: Array<Migration<string>> = [
       await version.save();
 
       const enabledFeatures = await fromStorage(Data.EnabledFeatures);
+      enabledFeatures.value.clear();
       for (const [key, value] of Object.entries(data.features)) {
         if (value) {
           const snakeCasedKey = key.replace(/([A-Z])/g, "-$1").toLowerCase();