FIX: If only one plan, automatically select it

assets/javascripts/discourse/components/payment-options.js.es6

@@ -1,9 +1,15 @@
 import Component from "@ember/component";
 
 export default Component.extend({
+  init() {
+    this._super(...arguments);
+    if (this.plans.length === 1) {
+      this.set("selectedPlan", this.plans[0].id);
+    }
+  },
   actions: {
     clickPlan(plan) {
       this.set("selectedPlan", plan.id);
-    }
-  }
+    },
+  },
 });