fix(search): silence warning for prop

Author: posva

src/client/theme-default/Layout.vue

@@ -6,7 +6,7 @@
           <AlgoliaSearchBox
             v-if="theme.algolia"
             :options="theme.algolia"
-            :multilang="theme.locales"
+            :multilang="!!theme.locales"
             :key="siteRouteData.lang"
           />
         </slot>