[Access] Fix event conversion in local TxResults endpoint

[peterargue]

When running an AN configured to use local events for tx results, the event conversion was thrown away. This was caused by updating a local variable reference within a loop instead of the original data.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 15.78947% with 16 lines in your changes are missing coverage. Please review.

Project coverage is 57.04%. Comparing base (5e65e12) to head (2d9d4b5).

Files	Patch %	Lines
engine/common/rpc/convert/events.go	0.00%	10 Missing ⚠️
...ss/rpc/backend/transactions_local_data_provider.go	33.33%	3 Missing and 3 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5582      +/-   ##
==========================================
+ Coverage   55.64%   57.04%   +1.39%     
==========================================
  Files        1037      872     -165     
  Lines      101338    86800   -14538     
==========================================
- Hits        56393    49514    -6879     
+ Misses      40605    33428    -7177     
+ Partials     4340     3858     -482     

Flag	Coverage Δ
unittests	57.04% <15.78%> (+1.39%)	⬆️

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