Fixed runner scan validation bug

ref #67

src/models/entities/Runner.ts

@@ -48,7 +48,7 @@ export class Runner extends Participant {
    * This is implemented here to avoid duplicate code in other files.
    */
   public get validScans(): Scan[] {
-    return this.scans.filter(scan => { scan.valid === true });
+    return this.scans.filter(scan => scan.valid == true);
   }
 
   /**