Fix Course Selection in Planner (Exemptions & Plan to Take)

[wr1159]

Context

Fixes #3650 where users cannot select modules in the "Exemptions" and "Plan to Take" sections of the planner page. Also renamed "Add course" button to "Add Category" to be clearer.

Implementation

Previously AllModules which displays all the modules in AddModule mistakenly filters out all the modules as EXEMPTION_SEMESTER and PLAN_TO_TAKE_SEMESTER had values of -1 and -2 respectively. The proposed change is to prevent filtering by semester in the AddModule for "Exemptions" and "Plan to Take".

Before	After

Other Information

Hi I am Wei Rong and I am looking forward to contribute more to nusmods!

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Codecov Report

Attention: Patch coverage is 0% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 53.59%. Comparing base (2f723c6) to head (6968ed5).

Files	Patch %	Lines
website/src/views/planner/PlannerModuleSelect.tsx	0.00%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #3683 +/- ## ========================================== - Coverage 53.61% 53.59% -0.02% ========================================== Files 272 272 Lines 5974 5974 Branches 1426 1426 ========================================== - Hits 3203 3202 -1 - Misses 2771 2772 +1 ```

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[ravern]

Hi I am Wei Rong and I am looking forward to contribute more to nusmods!

🚀🚀🚀