Fix react-select closing on select on mobile

Looks like this is a bug in react-select. closeMenuOnSelect={false}
should do this. But adding blurInputOnSelect is the workaround I guess.

JedWatson/react-select#2771

client/src/CreateHangoutPage.tsx

@@ -95,6 +95,7 @@ export function CreateHangoutPage() {
       </Heading>
       <CreatableSelect
         closeMenuOnSelect={false}
+        blurInputOnSelect={false}
         isMulti
         defaultValue={[] as SelectOption[]}
         value={friends}