Revert "Reduce buildFormData calls"

This reverts commit 34c06de.

We cannot use this.onChange here because on initial load there would be no
change in the formData and the onChange event would not be triggered.

client/src/components/Form/FormDisplay.vue

@@ -139,7 +139,10 @@ export default {
     },
     created() {
         this.onCloneInputs();
-        this.onChange();
+        // build flat formData that is ready to be submitted
+        this.formData = this.buildFormData();
+        // emit back to parent, so that parent has submittable data
+        this.$emit("onChange", this.formData);
         // highlight initial warnings
         this.onWarnings();
         // highlight initial errors