fixed dropdown name sharing bug

src/components/mario-comps/MarioFormula.tsx

@@ -39,7 +39,7 @@ function MarioFormula(): JSX.Element {
             index={1} //index for what KhanCard you are referring to
             answer={answerKey.question2} //the answer from answerkey
             update_answer={setIsCorrect}
-            name="mario-drop5"
+            name="mario-drop6"
           />
           )
         </div>