fix: Change tracked condition to make computed work

[iamareebjamal]

For some reason, on previous conditions, property was recomputed,
but UI wasn't updated. that only happened in production builds as well.
Changing the condition slightly as a workaround worked.

Upstream Issue: emberjs/ember.js#18988

Introduced in #4294 (f6bcfa1)

Fixes #4383

[vercel]

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[codecov]

Codecov Report

Merging #4392 into development will not change coverage.
The diff coverage is 50.00%.

@@             Coverage Diff              @@
##           development    #4392   +/-   ##
============================================
  Coverage        22.89%   22.89%           
============================================
  Files              468      468           
  Lines             4941     4941           
  Branches             5        5           
============================================
  Hits              1131     1131           
  Misses            3808     3808           
  Partials             2        2           

Impacted Files	Coverage Δ
app/components/modals/user-delete-modal.js	0.00% <0.00%> (ø)
app/components/modals/event-delete-modal.js	100.00% <100.00%> (ø)

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