Update logic determining the cursor style in the schedule

[natalynyu]

When the prefix is not active, the cursor should be a regular arrow to show that the course cannot be clicked to reveal a popover with more info on the course.

Types of changes

• [ ] Bug fix (non-breaking change which fixes an issue)
• [x] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• [x] I have run eslint on the code
• [ ] I have added JSDoc for all of my code (where applicable)
• [ ] I have added tests to cover my changes.

Priority:

• [x] Normal
• [ ] High

Related Issues:

Fixes #601

[codecov[bot]]

Codecov Report

Merging #612 (d5e2faf) into develop (ca7f14c) will decrease coverage by 0.02%. The diff coverage is n/a.

@@             Coverage Diff             @@
##           develop     #612      +/-   ##
===========================================
- Coverage    95.28%   95.25%   -0.03%     
===========================================
  Files          191      191              
  Lines         4472     4472              
  Branches       540      540              
===========================================
- Hits          4261     4260       -1     
  Misses         100      100              
- Partials       111      112       +1     

Impacted Files	Coverage Δ
.../client/components/pages/Schedule/ScheduleView.tsx	94.87% <ø> (-2.57%)	:arrow_down:

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