Fix ordering with d&d

src/components/SignupQuestionsWidget/SignupQuestionsWidget.tsx

@@ -41,9 +41,8 @@ class SignupQuestionsWidget extends React.Component<SignupQuestionsWidgetProps,
     const srcIndex = result.source.index;
     const dstIndex = result.destination.index;
     const srcCopy = { ...questions[srcIndex] };
-    const dstCopy = { ...questions[dstIndex] };
-    questions[dstIndex] = srcCopy;
-    questions[srcIndex] = dstCopy;
+    questions.splice(srcIndex, 1);
+    questions.splice(dstIndex, 0, srcCopy);
 
     this.onValueChange(questions);
   }