FRE-5352 Fix: store scan result in lastScanResult for getLastScanResult()

The runScan() method was returning scanResult but never assigning it
to this.lastScanResult, causing getLastScanResult() to always return null.

services/hometitle/src/scheduler.service.ts

@@ -149,6 +149,8 @@ export class HomeTitleSchedulerService {
       completedAt,
     };
 
+    this.lastScanResult = scanResult;
+
     return scanResult;
   }