fix: gofmt -s composite literal simplification in test harness

[Shashwat-Nautiyal]

Fixes a gofmt -s issue in the test harness that was causing make test_short to fail.
The change removes a redundant type name in a map composite literal as suggested by gofmt -s.

Changes

• Simplified composite literal in test/cli/harness/node.go
• Fixed formatting so that the short test suite passes again

Related Issue

Fixes #11259

Notes

• This is a pure formatting fix (no functional changes)
• I have performed a self-review of my own code
• My code passes make test_short
• gofmt -s has been applied where needed

[Shashwat-Nautiyal]

I am not able to add "skip/changelog" label from the sidebar. Idk whether it is a permission issue.

[lidel]

@Shashwat-Nautiyal thank you, but this was already addressed in #11256

(manual changelog check is something reviewer does, it is not possible to skip by design)