Fix broken addquestion difficulty

Author: tzyian

peerprep/app/questions/new/page.tsx

@@ -116,7 +116,11 @@ function NewQuestion({}: Props) {
           disabled={loading}
           label="Difficulty: "
           group="difficulty"
-          options={{ Easy: 1, Medium: 2, Hard: 3 }}
+          options={{
+            Easy: Difficulty.Easy,
+            Medium: Difficulty.Medium,
+            Hard: Difficulty.Hard,
+          }}
           onChange={handleFormTextInput}
         />
         <FormTextAreaInput

peerprep/components/shared/form/RadioButtonGroup.tsx

@@ -5,7 +5,7 @@ interface Props {
   label: string;
   group: string;
   options: {
-    [label: string]: number;
+    [label: string]: string;
   };
   required?: boolean;
   disabled?: boolean;