normalize_modules_json - trim values of `Module.Lecturers`
normalize_modules_json - trim values of `Module.Lecturers`

In preparation for an upcoming patch to display the Lecturers in the
`Module Description` column of the Module Finder page.

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

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