Fix columns mapping in BelongsToMorphedLoader

[roxblnfk]

🔍 What was changed

Fix columns mapping in WHERE statement

📝 Checklist

• How was this tested:
  • Tested manually
  • Unit tests added

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 91.68%. Comparing base (36b0f11) to head (6d3dbc9).
⚠️ Report is 7 commits behind head on 2.x.

Additional details and impacted files

@@             Coverage Diff              @@
##                2.x     #542      +/-   ##
============================================
+ Coverage     91.64%   91.68%   +0.03%     
  Complexity     1920     1920              
============================================
  Files           123      123              
  Lines          4945     4943       -2     
============================================
  Hits           4532     4532              
+ Misses          413      411       -2     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.