Fix expected and actual fields in the generated tests

[Dilhasha]

Purpose

$subject
Fixes #42219

Approach

Describe how you are implementing the solutions along with the design details.

Samples

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Remarks

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Check List

• Read the Contributing Guide
• Updated Change Log
• Checked Tooling Support (#)
• Added necessary tests
  • Unit Tests
  • Spec Conformance Tests
  • Integration Tests
  • Ballerina By Example Tests
• Increased Test Coverage
• Added necessary documentation
  • API documentation
  • Module documentation in Module.md files
  • Ballerina By Examples

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 76.71%. Comparing base (cc94e6e) to head (1955fdc).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##             master   #42228   +/-   ##
=========================================
  Coverage     76.71%   76.71%           
- Complexity    53071    53073    +2     
=========================================
  Files          2884     2884           
  Lines        200023   200023           
  Branches      26041    26041           
=========================================
+ Hits         153445   153453    +8     
+ Misses        38134    38126    -8     
  Partials       8444     8444           

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