unnecessary_lambda_linter catches functions with braces

[MichaelChirico]

Closes #1703

[codecov-commenter]

Codecov Report

Merging #1704 (00eec1b) into main (fb092eb) will increase coverage by 0.00%.
The diff coverage is 100.00%.

❗ Current head 00eec1b differs from pull request most recent head 9f146ba. Consider uploading reports for the commit 9f146ba to get more accurate results

@@           Coverage Diff           @@
##             main    #1704   +/-   ##
=======================================
  Coverage   98.77%   98.77%           
=======================================
  Files         104      104           
  Lines        4494     4498    +4     
=======================================
+ Hits         4439     4443    +4     
  Misses         55       55           

Impacted Files	Coverage Δ
R/unnecessary_lambda_linter.R	100.00% <100.00%> (ø)

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