fix(tm2): Enable coin benchmark tests after fixing panic error

[sunspirit99]

Relate to #907

Make a few small fixes to get this test working

Contributors' checklist...

• Added new tests, or not needed, or not feasible
• Provided an example (e.g. screenshot) to aid review or the PR is self-explanatory
• Updated the official documentation or not needed
• No breaking changes were made, or a BREAKING CHANGE: xxx message was included in the description
• Added references to related issues and PRs
• Provided any useful hints for running manual tests
• Added new benchmarks to generated graphs, if any. More info here.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 63.55%. Comparing base (1a57e81) to head (2a3605c).
Report is 2 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2884      +/-   ##
==========================================
+ Coverage   63.37%   63.55%   +0.18%     
==========================================
  Files         561      561              
  Lines       79199    79310     +111     
==========================================
+ Hits        50189    50403     +214     
+ Misses      25625    25523     -102     
+ Partials     3385     3384       -1     

Flag	Coverage Δ
contribs/gnodev	60.57% <ø> (ø)
contribs/gnofaucet	14.82% <ø> (-0.95%)	⬇️
gno.land	67.38% <ø> (ø)
gnovm	67.93% <ø> (ø)
misc/genstd	79.72% <ø> (ø)
tm2	62.34% <ø> (+0.08%)	⬆️

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[notJoon]

Could you please provide more detailed context for this PR's changes? thank you

[jefft0]

Removed the review/triage-pending label because core dev thehowl approved this PR.