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

@@           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!