remove duplicated call

[drammock]

PR Description

I encountered a case where the same helper function (_write_coordsystem_json) was being called twice in a row in write_raw_bids:

mne-bids/mne_bids/write.py

Lines 2035 to 2052 in 98cb9f5

	_write_coordsystem_json(
	raw=raw,
	unit=unit,
	hpi_coord_system=orient,
	sensor_coord_system=sensor_coord_system,
	fname=coordsystem_path.fpath,
	datatype=bids_path.datatype,
	overwrite=overwrite,
	)
	_write_coordsystem_json(
	raw=raw,
	unit=unit,
	hpi_coord_system=orient,
	sensor_coord_system=sensor_coord_system,
	fname=coordsystem_path.fpath,
	datatype=bids_path.datatype,
	overwrite=overwrite,
	)

Origin seems to be #980

This removes one of the duplicated calls.

Merge checklist

Maintainer, please confirm the following before merging.
If applicable:

• All comments are resolved
• This is not your own PR
• All CIs are happy
• PR title starts with [MRG]
• whats_new.rst is updated
• New contributors have been added to CITATION.cff
• PR description includes phrase "closes <#issue-number>"

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.42%. Comparing base (98cb9f5) to head (367e658).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1445      +/-   ##
==========================================
- Coverage   97.42%   97.42%   -0.01%     
==========================================
  Files          40       40              
  Lines        9137     9136       -1     
==========================================
- Hits         8902     8901       -1     
  Misses        235      235              

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[sappelhoff]

Thanks!