Clear search bar when a module is added to timetable

[leslieyip02]

Context

Resolves #3723

Implementation

https://github.com/nusmodifications/nusmods/assets/90888680/256f2d42-015d-4044-b9b7-ad58ea337956

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[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 53.59%. Comparing base (ae6e97d) to head (586b3ff).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #3728 +/- ## ======================================= Coverage 53.58% 53.59% ======================================= Files 272 272 Lines 5987 5988 +1 Branches 1434 1434 ======================================= + Hits 3208 3209 +1 Misses 2779 2779 ```

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[kokrui]

Nice work, thanks for the contribution!