test(gnoland): test content mismatch for addpkg.txtar

[linhpn99]

Updated the test content in addpkg.txtar test file to correctly align with its intended purpose. The test now reflects an addpkg scenario instead of only test call

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 60.45%. Comparing base (f04ec89) to head (07b3b55).
Report is 4 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2766      +/-   ##
==========================================
+ Coverage   60.44%   60.45%   +0.01%     
==========================================
  Files         563      563              
  Lines       75159    75158       -1     
==========================================
+ Hits        45427    45434       +7     
+ Misses      26343    26335       -8     
  Partials     3389     3389              

Flag	Coverage Δ
contribs/gnodev	61.46% <ø> (ø)
contribs/gnofaucet	14.46% <ø> (-0.86%)	⬇️
gno.land	67.21% <ø> (ø)
gnovm	64.46% <ø> (ø)
misc/genstd	80.54% <ø> (ø)
misc/logos	19.88% <ø> (ø)
tm2	62.08% <ø> (+0.02%)	⬆️

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[leohhhn]

#2333 (comment)