fix(index): Re-prompt local index download on each device

Makes more sense if we'd like users to use the index everywhere.

Also makes testing easier (as the user can't undo this one)

src/app/app.component.ts

@@ -319,7 +319,6 @@ export class AppComponent implements OnInit, AfterViewInit, CanvasTableSelectLis
       // sidebar
       this.showPopularRecipients = prefs.get(`${this.preferenceService.prefGroup}:${LOCAL_STORAGE_SHOW_POPULAR_RECIPIENTS}`) === 'true';
       this.avatarSource = prefs.get(`${this.preferenceService.prefGroup}:avatarSource`);
-      this.localSearchIndexPrompted = prefs.get(`${this.preferenceService.prefGroup}:localSearchPromptDisplayed`) === 'true';
 
       this.preferences = prefs;
     });