Accept should start with automatic number (#175)

Not tested, but this feels like correct change :) 

If it's wrong, I will look into it more during next week.

melon-head/src/App/ApplicationDetail.res

@@ -243,7 +243,7 @@ module Actions = {
       ~modal: Modal.Interface.t,
       ~openApplications,
     ) => {
-      let (memberNumber, setMemberNumber) = React.useState(_ => Some(""))
+      let (memberNumber, setMemberNumber) = React.useState(_ => None)
 
       // Api errors
       let (error, setError) = React.useState(() => None)