Verify correctness of asserted gas value in `l1_handler_cost` test

[franciszekjob]

Current State

While bumping blockifier to 0.14.0-rc.1, asserted gas value in l1_handler_cost has changed. The calculations are a bit different to what is currently shown in the message cost docs. We should verify if our calculations are correct (docs may be outdated).

Objective

Verify correctness of asserted gas value in l1_handler_cost test

Additional Context

No response

[cptartur]

@ddoktorski relevant to gas tests