fix: Filter attendee form from all custom forms

[iamareebjamal]

Fixes #4597

Ember Data strikes again. There is a custom function query used everywhere throughout the project which filters out the items from server. But ember data returns all the items from local in memory DB because how cool it is, and this custom query method does not take it into account. Hence, once all custom form fields are loaded in memory, it returns all the items rather than just the attendee custom form

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[codecov]

Codecov Report

Merging #4601 into development will decrease coverage by 0.00%.
The diff coverage is 0.00%.

@@               Coverage Diff               @@
##           development    #4601      +/-   ##
===============================================
- Coverage        22.27%   22.27%   -0.01%     
===============================================
  Files              474      474              
  Lines             4987     4988       +1     
  Branches             8        8              
===============================================
  Hits              1111     1111              
- Misses            3875     3876       +1     
  Partials             1        1              

Impacted Files	Coverage Δ
app/routes/events/view/edit/attendee.js	0.00% <0.00%> (ø)

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[mariobehling]

OMG! Thanks for the fix!