Small simplification in _TypedNodeOrEdgeListAdapter

[erlendvollset]

Description

Please describe the change you have made.

Checklist:

• Tests added/updated.
• Documentation updated. Documentation is generated from docstrings - these must be updated according to your change.
  If a new method has been added it should be referenced in cognite.rst in order to generate docs based on its docstring.
• Changelog updated in CHANGELOG.md.
• Version bumped. If triggering a new release is desired, bump the version number in _version.py and pyproject.toml per semantic versioning.

[codecov]

Codecov Report

Attention: Patch coverage is 66.66667% with 1 line in your changes missing coverage. Please review.

Project coverage is 90.20%. Comparing base (9cb61f8) to head (120469c).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
cognite/client/_api/data_modeling/instances.py	66.66%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1994   +/-   ##
=======================================
  Coverage   90.19%   90.20%           
=======================================
  Files         139      139           
  Lines       21772    21772           
=======================================
+ Hits        19638    19640    +2     
+ Misses       2134     2132    -2     

Files with missing lines	Coverage Δ
cognite/client/_api/data_modeling/instances.py	87.83% <66.66%> (ø)

... and 1 file with indirect coverage changes