Fix incorrectly placed newline in CSV export

[Jckf]

PR #8395 added a column for RSSI to the Range Test module's CSV export, but did not move the newline that is supposed to appear at the end of each record. This results in misaligned columns in the CSV file.

This PR moves the newline character from inside on of the column printf calls, where it's honestly quite easy to miss, and moves it to its own printf call. Hopefully this makes it less likely that something similar happens again.

🤝 Attestations

• I have tested that my proposed changes behave as described.
• I have tested that my proposed changes do not cause any obvious regressions on the following devices:
  • Heltec (Lora32) V3
  • LilyGo T-Deck
  • LilyGo T-Beam
  • RAK WisBlock 4631
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Summary by CodeRabbit

• Bug Fixes
  • Corrected range-test CSV formatting so payload and RSSI values appear on the same row.
  • Added the proper comma separator and row terminator placement for exported test results.

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• src/modules/RangeTestModule.cpp

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📝 Walkthrough

Walkthrough

The range-test CSV writer now separates payload and RSSI with a comma and emits the newline after RSSI.

Changes

Range-test CSV output

Layer / File(s)	Summary
CSV row formatting src/modules/RangeTestModule.cpp	The writer outputs the payload, a comma, RSSI, and a newline in one row.

Estimated code review effort: 1 (Trivial) | ~5 minutes

Merge Risk: 🟡 Moderate · up to 7c5ab

The export still adds an extra CSV column after the final RSSI value, which can break consumers that require matching header and row column counts. Fix this formatting issue or obtain explicit acceptance before merging.

Suggested reviewers: jp-bennett, thebentern, caveman99

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly and concisely describes the corrected newline placement in the CSV export.
Description check	✅ Passed	The description explains the bug and fix clearly, but both required testing attestations remain unchecked.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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Actionable comments posted: 1

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Inline comments:
In `@src/modules/RangeTestModule.cpp`:
- Line 314: Update the final RSSI field write in RangeTestModule so mp.rx_rssi
is emitted without a trailing comma, while preserving the separate newline call
that follows.

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[Jckf]

Warning

⚠️ This pull request shows signs of AI-generated slop (redundant_comments). It has been flagged by CodeRabbit slop detection and should be reviewed carefully.

No AI was involved. The comment is there because, like I stated in the PR description, I want to make it obvious where in the code the newline happens, so that future changes don't accidentally introduce columns after it again.

EDIT: Comment removed.

[caveman99]

@jkcf While we are modifying this, we may as well fix the trailing comma.

[Jckf]

@jkcf While we are modifying this, we may as well fix the trailing comma.

Who are you talking to? 😄

I like to keep all elements in lists consistent, when possible. Having the last element be "special" is a foot-gun.

Removed it now though 👍