Fix SplitTooLongLine breaking long keyword names

[bhirsz]

Closes #314

[codecov-commenter]

Codecov Report

Merging #315 (684274a) into main (528dd8e) will not change coverage.
The diff coverage is 100.00%.

❗ Current head 684274a differs from pull request most recent head 21ddf66. Consider uploading reports for the commit 21ddf66 to get more accurate results

@@           Coverage Diff           @@
##             main     #315   +/-   ##
=======================================
  Coverage   97.33%   97.33%           
=======================================
  Files          37       37           
  Lines        2592     2592           
=======================================
  Hits         2523     2523           
  Misses         69       69           

Impacted Files	Coverage Δ
robotidy/transformers/SplitTooLongLine.py	100.00% <100.00%> (ø)
robotidy/version.py	100.00% <100.00%> (ø)

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