Initialize Select2 outside of `initialize-exhibit3`
Initialize Select2 outside of `initialize-exhibit3`

Because we are going to generalize the code we have for adding an exact
same input box on the Timetable Builder page.

Signed-off-by: Pang Yan Han <22594c345857f664c61cd411f607c4d40a9d4af9@gmail.com>

yanhan/cljs-nusmods,yanhan/cljs-nusmods,yanhan/cljs-nusmods