fix: Toss Out Invalid Amount On VFs For SR-IOV

* toss out anything less than or equal to zero for the SR-IOV device
  virtual function addresses
* avoid making an API call out to the endpoint, reducing network chatter

Resolves: github.com/harvester/harvester/issues/3977

pkg/harvester/dialog/EnableSriovDevice.vue

@@ -39,6 +39,12 @@ export default {
 
       try {
         this.resources[0].spec.numVFs = this.numVFs;
+        if (this.resources[0].spec.numVFs <= 0) {
+          this.resources[0].spec.numVFs = 0;
+          this.numVFs = 0;
+          this.close();
+          return;
+        }
         await actionResource.save();
         buttonCb(true);
         this.close();