[accelerator] streamline payment method logic

frontend/src/app/components/tracker/tracker.component.ts

@@ -751,7 +751,7 @@ export class TrackerComponent implements OnInit, OnDestroy {
   }
 
   get cashappEligible(): boolean {
-    return this.mempoolPosition?.block > 0;
+    return this.mempoolPosition?.block > 0 && this.tx.weight < 4000;
   }
 
   get showAccelerationSummary(): boolean {