Fix alignment detection for one column, mixed named/unnamed

[lorenzwalthert]

Closes #984.

[IndrajeetPatil]

LGTM! Thanks.

Just one minor nit to address.

[lorenzwalthert]

right... I think it's time to activate the lintr pre-commit hook so my float subsetting does not start to crumble your conutless changes in that field.

[codecov-commenter]

Codecov Report

Merging #1035 (d24fcfa) into main (305644b) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main    #1035   +/-   ##
=======================================
  Coverage   91.08%   91.08%           
=======================================
  Files          46       46           
  Lines        2691     2691           
=======================================
  Hits         2451     2451           
  Misses        240      240           

Impacted Files	Coverage Δ
R/detect-alignment.R	97.80% <100.00%> (ø)

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[github-actions]

This is how benchmark results would change (along with a 95% confidence interval in relative change) if 8e39777 is merged into main:

•   :rocket:cache_applying: 31.9ms -> 28.4ms [-13.7%, -8.07%]
•   :ballot_box_with_check:cache_recording: 850ms -> 850ms [-1.39%, +1.42%]
•   :ballot_box_with_check:without_cache: 2.12s -> 2.11s [-1.52%, +0.58%]

Further explanation regarding interpretation and methodology can be found in the documentation.