Fix productId

plugins/Blamsoft-XFXDistortionPack.json

@@ -6,15 +6,5 @@
   "version": "0.5.1",
   "homepage": "http://blamsoft.com/vcv-rack/xfx-distortion-pack",
   "manual": "http://blamsoft.com/wp-content/uploads/2018/01/XFXDistortionPackUserManual.pdf",
-  "downloads": {
-    "win": {
-      "productId": "800730710059"
-    },
-    "mac": {
-      "productId": "800730710059"
-    },
-    "lin": {
-      "productId": "800730710059"
-    }
-  }
+  "productId": "800730710059"
 }