fix: remove computed isCurrent property for subscription plans

[adamstankiewicz]

For all changes

• Ensure adequate tests are in place (or reviewed existing tests cover changes)
• Ensure English strings are marked for translation. See documentation for more details.

Only if submitting a visual change

• Ensure to attach screenshots
• Ensure to have UX team confirm screenshots

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 86.79%. Comparing base (dd43222) to head (1fda3f1).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1122      +/-   ##
==========================================
- Coverage   86.79%   86.79%   -0.01%     
==========================================
  Files         380      380              
  Lines        7916     7913       -3     
  Branches     1943     1905      -38     
==========================================
- Hits         6871     6868       -3     
  Misses        995      995              
  Partials       50       50              

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