Shift position of `is-module-selected?` function
Shift position of `is-module-selected?` function

So that it is directly below the definition of the `ModulesSelected`
global.

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

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